diff --git a/tools/patches/flutter-engine/a3815b659047cfc6b63d41d180aa1ca1b781ee68.patch b/tools/patches/flutter-engine/a3815b659047cfc6b63d41d180aa1ca1b781ee68.patch
new file mode 100644
index 00000000000..ab3841ad0a5
--- /dev/null
+++ b/tools/patches/flutter-engine/a3815b659047cfc6b63d41d180aa1ca1b781ee68.patch
@@ -0,0 +1,597 @@
+diff --git a/DEPS b/DEPS
+index 01113f340..e55da1cff 100644
+--- a/DEPS
++++ b/DEPS
+@@ -34,14 +34,14 @@ vars = {
+   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
+   # You can use //tools/dart/create_updated_flutter_deps.py to produce
+   # updated revision list of existing dependencies.
+-  'dart_revision': '84e5eeaea43ec1d636c8742b55c1bc0527b436c8',
++  'dart_revision': '9b79101c2e8db6875b62ed2ad5042df74f8d0fe1',
+ 
+   # WARNING: DO NOT EDIT MANUALLY
+   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
+   'dart_args_tag': '1.6.0',
+   'dart_boringssl_gen_rev': '429ccb1877f7987a6f3988228bc2440e61293499',
+   'dart_boringssl_rev': '4dfd5af70191b068aebe567b8e29ce108cee85ce',
+-  'dart_collection_rev': '80f5b6de8a8d8d584732a71bb59912da3e44883b',
++  'dart_collection_rev': '583693680fc067e34ca5b72503df25e8b80579f9',
+   'dart_dart2js_info_tag': '0.6.0',
+   'dart_dart_style_tag': '1.3.6',
+   'dart_http_retry_tag': '0.1.1',
+@@ -49,7 +49,6 @@ vars = {
+   'dart_intl_tag': '0.16.1',
+   'dart_linter_tag': '0.1.117',
+   'dart_oauth2_tag': '1.6.0',
+-  'dart_pedantic_tag': 'v1.9.0',
+   'dart_protobuf_rev': '3746c8fd3f2b0147623a8e3db89c3ff4330de760',
+   'dart_pub_rev': '04b054b62cc437cf23451785fdc50e49cd9de139',
+   'dart_pub_semver_tag': 'v1.4.4',
+@@ -61,15 +60,13 @@ vars = {
+   'dart_shelf_static_rev': 'v0.2.8',
+   'dart_shelf_tag': '0.7.3+3',
+   'dart_shelf_web_socket_tag': '0.2.2+3',
+-  'dart_source_map_stack_trace_tag': '2.0.0',
+-  'dart_source_span_tag': '1.7.0',
+   'dart_sse_tag': 'e5cf68975e8e87171a3dc297577aa073454a91dc',
+-  'dart_stack_trace_tag': '56811dbb2530d823b764fe167ec335879a4adb32',
++  'dart_stack_trace_tag': 'd3813ca0a77348e0faf0d6af0cc17913e36afa39',
+   'dart_stagehand_tag': 'v3.3.9',
+-  'dart_stream_channel_tag': '70433d577be02c48cb16d72d65654f3b4d82c6ed',
++  'dart_stream_channel_tag': 'c446774fd077c9bdbd6235a7aadc661ef60a9727',
+   'dart_test_reflective_loader_tag': '0.1.9',
+   'dart_tflite_native_rev': '3c777c40608a2a9f1427bfe0028ab48e7116b4c1',
+-  'dart_typed_data_tag': '0c369b73a9b7ebf042c06512951bfe5b52b84a5f',
++  'dart_typed_data_tag': 'f94fc57b8e8c0e4fe4ff6cfd8290b94af52d3719',
+   'dart_usage_tag': '3.4.0',
+   'dart_watcher_rev': 'fc3c9aae5d31d707b3013b42634dde8d8a1161b4',
+ 
+@@ -171,13 +168,13 @@ deps = {
+    Var('dart_git') + '/args.git' + '@' + Var('dart_args_tag'),
+ 
+   'src/third_party/dart/third_party/pkg/async':
+-   Var('dart_git') + '/async.git@6b90f4557f330e1ead021f501ee7f1d8b0e77815',
++   Var('dart_git') + '/async.git@128c461a97dbdbd9336ba000ba5a5c02e79b8651',
+ 
+   'src/third_party/dart/third_party/pkg/bazel_worker':
+    Var('dart_git') + '/bazel_worker.git@26680d5e249b249c7216ab2fed0ac8ed4ee285c5',
+ 
+   'src/third_party/dart/third_party/pkg/boolean_selector':
+-   Var('dart_git') + '/boolean_selector.git@1309eabed510cc3b7536fd4367d39b97ebee3d69',
++   Var('dart_git') + '/boolean_selector.git@665e6921ab246569420376f827bff4585dff0b14',
+ 
+   'src/third_party/dart/third_party/pkg/charcode':
+    Var('dart_git') + '/charcode.git@af1e2d59a9c383da94f99ea51dac4b93fb0626c4',
+@@ -207,7 +204,7 @@ deps = {
+    Var('dart_git') + '/ffi.git@454ab0f9ea6bd06942a983238d8a6818b1357edb',
+ 
+   'src/third_party/dart/third_party/pkg/fixnum':
+-   Var('dart_git') + '/fixnum.git@9b38f49f6679654d66a363e69e48173cca07e882',
++   Var('dart_git') + '/fixnum.git@300c3f025e94a72b7b6770e15f76a4de15f77668',
+ 
+   'src/third_party/dart/third_party/pkg/glob':
+    Var('dart_git') + '/glob.git@e9f4e6b7ae8abe5071461cf8f47191bb19cf7ef6',
+@@ -246,7 +243,7 @@ deps = {
+    Var('dart_git') + '/markdown.git@dd150bb64c5f3b41d31f20f399ae2a855f7f8c00',
+ 
+   'src/third_party/dart/third_party/pkg/matcher':
+-   Var('dart_git') + '/matcher.git@8f8d965933c94a489b1a39e20d558a32841bfa5b',
++   Var('dart_git') + '/matcher.git@9cae8faa7868bf3a88a7ba45eb0bd128e66ac515',
+ 
+   'src/third_party/dart/third_party/pkg/mime':
+    Var('dart_git') + '/mime.git@179b5e6a88f4b63f36dc1b8fcbc1e83e5e0cd3a7',
+@@ -261,13 +258,13 @@ deps = {
+    Var('dart_git') + '/oauth2.git' + '@' + Var('dart_oauth2_tag'),
+ 
+   'src/third_party/dart/third_party/pkg/path':
+-   Var('dart_git') + '/path.git@4f3bb71843fe5493ba490828a1721821d7b33746',
++   Var('dart_git') + '/path.git@62ecd5a78ffe5734d14ed0df76d20309084cd04a',
+ 
+   'src/third_party/dart/third_party/pkg/pedantic':
+-   Var('dart_git') + '/pedantic.git' + '@' + Var('dart_pedantic_tag'),
++   Var('dart_git') + '/pedantic.git@24b38df72430d7e21cb4257828580becb9a39c72',
+ 
+   'src/third_party/dart/third_party/pkg/pool':
+-   Var('dart_git') + '/pool.git@86fbb2cde9bbc66c8d159909d2f65a5981ea5b50',
++   Var('dart_git') + '/pool.git@eedbd5fde84f9a1a8da643b475305a81841da599',
+ 
+   'src/third_party/dart/third_party/pkg/protobuf':
+    Var('dart_git') + '/protobuf.git' + '@' + Var('dart_protobuf_rev'),
+@@ -300,13 +297,13 @@ deps = {
+    Var('dart_git') + '/shelf_web_socket.git' + '@' + Var('dart_shelf_web_socket_tag'),
+ 
+   'src/third_party/dart/third_party/pkg/source_map_stack_trace':
+-   Var('dart_git') + '/source_map_stack_trace.git' + '@' + Var('dart_source_map_stack_trace_tag'),
++   Var('dart_git') + '/source_map_stack_trace.git@1c3026f69d9771acf2f8c176a1ab750463309cce',
+ 
+   'src/third_party/dart/third_party/pkg/source_maps':
+-   Var('dart_git') + '/source_maps.git@87b4fd9027378bbd51b02e9d7df794eee8a82b7a',
++   Var('dart_git') + '/source_maps.git@53eb92ccfe6e64924054f83038a534b959b12b3e',
+ 
+   'src/third_party/dart/third_party/pkg/source_span':
+-   Var('dart_git') + '/source_span.git' + '@' + Var('dart_source_span_tag'),
++   Var('dart_git') + '/source_span.git@94833d6cbf4552ebe5d2aa6714acecd93834e53a',
+ 
+   'src/third_party/dart/third_party/pkg/sse':
+    Var('dart_git') + '/sse.git' + '@' + Var('dart_sse_tag'),
+@@ -321,13 +318,13 @@ deps = {
+    Var('dart_git') + '/stream_channel.git' + '@' + Var('dart_stream_channel_tag'),
+ 
+   'src/third_party/dart/third_party/pkg/string_scanner':
+-   Var('dart_git') + '/string_scanner.git@a918e7371af6b6e73bfd534ff9da6084741c1f99',
++   Var('dart_git') + '/string_scanner.git@1b63e6e5db5933d7be0a45da6e1129fe00262734',
+ 
+   'src/third_party/dart/third_party/pkg/term_glyph':
+-   Var('dart_git') + '/term_glyph.git@b3da31e9684a99cfe5f192b89914492018b44da7',
++   Var('dart_git') + '/term_glyph.git@6a0f9b6fb645ba75e7a00a4e20072678327a0347',
+ 
+   'src/third_party/dart/third_party/pkg/test':
+-   Var('dart_git') + '/test.git@718fe6f93c4655208460f28e89d887c5ef4144c5',
++   Var('dart_git') + '/test.git@c6b3fe63eda87da1687580071cad1eefd575f851',
+ 
+   'src/third_party/dart/third_party/pkg/test_reflective_loader':
+    Var('dart_git') + '/test_reflective_loader.git' + '@' + Var('dart_test_reflective_loader_tag'),
+@@ -357,7 +354,7 @@ deps = {
+    Var('dart_git') + '/package_config.git@9c586d04bd26fef01215fd10e7ab96a3050cfa64',
+ 
+   'src/third_party/dart/tools/sdks':
+-   {'packages': [{'version': 'version:2.9.0-21.0.dev', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
++   {'packages': [{'version': 'version:2.10.0-0.2-preview', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+ 
+   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
+ 
+diff --git a/lib/ui/annotations.dart b/lib/ui/annotations.dart
+index 45d8ca6cc..b300af073 100644
+--- a/lib/ui/annotations.dart
++++ b/lib/ui/annotations.dart
+@@ -4,7 +4,7 @@
+ 
+ // TODO(dnfield): Remove unused_import ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/channel_buffers.dart b/lib/ui/channel_buffers.dart
+index cb32c4581..39d31d271 100644
+--- a/lib/ui/channel_buffers.dart
++++ b/lib/ui/channel_buffers.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/compositing.dart b/lib/ui/compositing.dart
+index ea3c0b714..4e0553936 100644
+--- a/lib/ui/compositing.dart
++++ b/lib/ui/compositing.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/geometry.dart b/lib/ui/geometry.dart
+index 2739048e7..a7404996c 100644
+--- a/lib/ui/geometry.dart
++++ b/lib/ui/geometry.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/hash_codes.dart b/lib/ui/hash_codes.dart
+index a6ede7849..7da175a27 100644
+--- a/lib/ui/hash_codes.dart
++++ b/lib/ui/hash_codes.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/hooks.dart b/lib/ui/hooks.dart
+index ff2dcaa12..39bab1240 100644
+--- a/lib/ui/hooks.dart
++++ b/lib/ui/hooks.dart
+@@ -4,7 +4,7 @@
+ 
+ // TODO(dnfield): Remove unused_import ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/isolate_name_server.dart b/lib/ui/isolate_name_server.dart
+index d976e0ac2..4b5c2c84d 100644
+--- a/lib/ui/isolate_name_server.dart
++++ b/lib/ui/isolate_name_server.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/lerp.dart b/lib/ui/lerp.dart
+index db9f7b2ec..0bb0a08b7 100644
+--- a/lib/ui/lerp.dart
++++ b/lib/ui/lerp.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/natives.dart b/lib/ui/natives.dart
+index ce29fe15c..0f2939592 100644
+--- a/lib/ui/natives.dart
++++ b/lib/ui/natives.dart
+@@ -4,7 +4,7 @@
+ 
+ // TODO(dnfield): remove unused_element ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
+index 992db71cf..2599f90e2 100644
+--- a/lib/ui/painting.dart
++++ b/lib/ui/painting.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/plugins.dart b/lib/ui/plugins.dart
+index 64eca6e04..9622852fd 100644
+--- a/lib/ui/plugins.dart
++++ b/lib/ui/plugins.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/pointer.dart b/lib/ui/pointer.dart
+index 3c12cb971..3c8ffefaf 100644
+--- a/lib/ui/pointer.dart
++++ b/lib/ui/pointer.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/semantics.dart b/lib/ui/semantics.dart
+index bee542328..518a69412 100644
+--- a/lib/ui/semantics.dart
++++ b/lib/ui/semantics.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/text.dart b/lib/ui/text.dart
+index 8bdc0f05d..c246731d8 100644
+--- a/lib/ui/text.dart
++++ b/lib/ui/text.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ 
+ part of dart.ui;
+ 
+diff --git a/lib/ui/ui.dart b/lib/ui/ui.dart
+index 7612cf509..fe0e4fa16 100644
+--- a/lib/ui/ui.dart
++++ b/lib/ui/ui.dart
+@@ -9,7 +9,7 @@
+ /// This library exposes the lowest-level services that Flutter frameworks use
+ /// to bootstrap applications, such as classes for driving the input, graphics
+ /// text, layout, and rendering subsystems.
+-// @dart = 2.9
++// @dart = 2.10
+ library dart.ui;
+ 
+ import 'dart:_internal' hide Symbol; // ignore: unused_import
+diff --git a/lib/ui/window.dart b/lib/ui/window.dart
+index 815bee5a1..22f9ed0c3 100644
+--- a/lib/ui/window.dart
++++ b/lib/ui/window.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of dart.ui;
+ 
+ /// Signature of callbacks that have no arguments and return no data.
+diff --git a/lib/web_ui/lib/src/ui/annotations.dart b/lib/web_ui/lib/src/ui/annotations.dart
+index 977ca70ca..7dac0c567 100644
+--- a/lib/web_ui/lib/src/ui/annotations.dart
++++ b/lib/web_ui/lib/src/ui/annotations.dart
+@@ -4,7 +4,7 @@
+ 
+ // TODO(dnfield): Remove unused_import ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ // TODO(dnfield): Update this if/when we default this to on in the tool,
+diff --git a/lib/web_ui/lib/src/ui/canvas.dart b/lib/web_ui/lib/src/ui/canvas.dart
+index 1061ab718..ee185ef29 100644
+--- a/lib/web_ui/lib/src/ui/canvas.dart
++++ b/lib/web_ui/lib/src/ui/canvas.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Defines how a list of points is interpreted when drawing a set of points.
+diff --git a/lib/web_ui/lib/src/ui/channel_buffers.dart b/lib/web_ui/lib/src/ui/channel_buffers.dart
+index 5d3db5da5..6ce0bc962 100644
+--- a/lib/web_ui/lib/src/ui/channel_buffers.dart
++++ b/lib/web_ui/lib/src/ui/channel_buffers.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// A saved platform message for a channel with its callback.
+diff --git a/lib/web_ui/lib/src/ui/compositing.dart b/lib/web_ui/lib/src/ui/compositing.dart
+index 635dd7261..11a0e1199 100644
+--- a/lib/web_ui/lib/src/ui/compositing.dart
++++ b/lib/web_ui/lib/src/ui/compositing.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// An opaque object representing a composited scene.
+diff --git a/lib/web_ui/lib/src/ui/geometry.dart b/lib/web_ui/lib/src/ui/geometry.dart
+index 904cec065..c528c8c73 100644
+--- a/lib/web_ui/lib/src/ui/geometry.dart
++++ b/lib/web_ui/lib/src/ui/geometry.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Base class for [Size] and [Offset], which are both ways to describe
+diff --git a/lib/web_ui/lib/src/ui/hash_codes.dart b/lib/web_ui/lib/src/ui/hash_codes.dart
+index 69aeb33bb..e91fb1cc5 100644
+--- a/lib/web_ui/lib/src/ui/hash_codes.dart
++++ b/lib/web_ui/lib/src/ui/hash_codes.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ class _HashEnd { const _HashEnd(); }
+diff --git a/lib/web_ui/lib/src/ui/initialization.dart b/lib/web_ui/lib/src/ui/initialization.dart
+index 2749fa9e5..6865da812 100644
+--- a/lib/web_ui/lib/src/ui/initialization.dart
++++ b/lib/web_ui/lib/src/ui/initialization.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Initializes the platform.
+diff --git a/lib/web_ui/lib/src/ui/lerp.dart b/lib/web_ui/lib/src/ui/lerp.dart
+index bcc278f8a..5cd4c8ac1 100644
+--- a/lib/web_ui/lib/src/ui/lerp.dart
++++ b/lib/web_ui/lib/src/ui/lerp.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Linearly interpolate between two numbers.
+diff --git a/lib/web_ui/lib/src/ui/natives.dart b/lib/web_ui/lib/src/ui/natives.dart
+index e4bf1a2f5..4763db34e 100644
+--- a/lib/web_ui/lib/src/ui/natives.dart
++++ b/lib/web_ui/lib/src/ui/natives.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ // Corelib 'print' implementation.
+diff --git a/lib/web_ui/lib/src/ui/painting.dart b/lib/web_ui/lib/src/ui/painting.dart
+index a9bd10662..67da1842f 100644
+--- a/lib/web_ui/lib/src/ui/painting.dart
++++ b/lib/web_ui/lib/src/ui/painting.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ // ignore: unused_element, Used in Shader assert.
+diff --git a/lib/web_ui/lib/src/ui/path.dart b/lib/web_ui/lib/src/ui/path.dart
+index 18e351f53..1514d2432 100644
+--- a/lib/web_ui/lib/src/ui/path.dart
++++ b/lib/web_ui/lib/src/ui/path.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// A complex, one-dimensional subset of a plane.
+diff --git a/lib/web_ui/lib/src/ui/path_metrics.dart b/lib/web_ui/lib/src/ui/path_metrics.dart
+index 6d54888c2..b65e2b928 100644
+--- a/lib/web_ui/lib/src/ui/path_metrics.dart
++++ b/lib/web_ui/lib/src/ui/path_metrics.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// An iterable collection of [PathMetric] objects describing a [Path].
+diff --git a/lib/web_ui/lib/src/ui/pointer.dart b/lib/web_ui/lib/src/ui/pointer.dart
+index 698badcc4..e2f351caf 100644
+--- a/lib/web_ui/lib/src/ui/pointer.dart
++++ b/lib/web_ui/lib/src/ui/pointer.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// How the pointer has changed since the last report.
+diff --git a/lib/web_ui/lib/src/ui/semantics.dart b/lib/web_ui/lib/src/ui/semantics.dart
+index c6dffe2fc..a0fde9a5b 100644
+--- a/lib/web_ui/lib/src/ui/semantics.dart
++++ b/lib/web_ui/lib/src/ui/semantics.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// The possible actions that can be conveyed from the operating system
+diff --git a/lib/web_ui/lib/src/ui/test_embedding.dart b/lib/web_ui/lib/src/ui/test_embedding.dart
+index f72a5c75e..955dbfe53 100644
+--- a/lib/web_ui/lib/src/ui/test_embedding.dart
++++ b/lib/web_ui/lib/src/ui/test_embedding.dart
+@@ -4,7 +4,7 @@
+ 
+ // TODO(flutter_web): the Web-only API below need to be cleaned up.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Used to track when the platform is initialized. This ensures the test fonts
+diff --git a/lib/web_ui/lib/src/ui/text.dart b/lib/web_ui/lib/src/ui/text.dart
+index ec9a45943..58698d862 100644
+--- a/lib/web_ui/lib/src/ui/text.dart
++++ b/lib/web_ui/lib/src/ui/text.dart
+@@ -3,7 +3,7 @@
+ // found in the LICENSE file.
+ // Synced 2019-05-30T14:20:57.833907.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Whether to slant the glyphs in the font
+diff --git a/lib/web_ui/lib/src/ui/tile_mode.dart b/lib/web_ui/lib/src/ui/tile_mode.dart
+index 8fd24ae58..9ce9ddf3c 100644
+--- a/lib/web_ui/lib/src/ui/tile_mode.dart
++++ b/lib/web_ui/lib/src/ui/tile_mode.dart
+@@ -2,7 +2,7 @@
+ // Use of this source code is governed by a BSD-style license that can be
+ // found in the LICENSE file.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Defines what happens at the edge of the gradient.
+diff --git a/lib/web_ui/lib/src/ui/window.dart b/lib/web_ui/lib/src/ui/window.dart
+index 557e6aa84..fd9e66740 100644
+--- a/lib/web_ui/lib/src/ui/window.dart
++++ b/lib/web_ui/lib/src/ui/window.dart
+@@ -3,7 +3,7 @@
+ // found in the LICENSE file.
+ // Synced 2019-05-30T14:20:57.841444.
+ 
+-// @dart = 2.9
++// @dart = 2.10
+ part of ui;
+ 
+ /// Signature of callbacks that have no arguments and return no data.
+diff --git a/lib/web_ui/lib/ui.dart b/lib/web_ui/lib/ui.dart
+index 49217e14a..13d5ee281 100644
+--- a/lib/web_ui/lib/ui.dart
++++ b/lib/web_ui/lib/ui.dart
+@@ -5,7 +5,7 @@
+ /// This library defines the web equivalent of the native dart:ui.
+ ///
+ /// All types in this library are public.
+-// @dart = 2.9
++// @dart = 2.10
+ library ui;
+ 
+ import 'dart:async';
diff --git a/tools/patches/flutter-engine/f997d62a6d29fa23ca140a60bba987fac7251c56.patch b/tools/patches/flutter-engine/f997d62a6d29fa23ca140a60bba987fac7251c56.patch
deleted file mode 100644
index 2de0d9bc555..00000000000
--- a/tools/patches/flutter-engine/f997d62a6d29fa23ca140a60bba987fac7251c56.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-diff --git a/DEPS b/DEPS
-index a4ee1ba7e..862c7d8f7 100644
---- a/DEPS
-+++ b/DEPS
-@@ -170,7 +170,7 @@ deps = {
-    Var('dart_git') + '/args.git' + '@' + Var('dart_args_tag'),
- 
-   'src/third_party/dart/third_party/pkg/async':
--   Var('dart_git') + '/async.git@e0c41e0c1fb70ba606dc81335c981af7c00987c6',
-+   Var('dart_git') + '/async.git@5a4373458bfc902e4a4064427c619c2b41783f0d',
- 
-   'src/third_party/dart/third_party/pkg/bazel_worker':
-    Var('dart_git') + '/bazel_worker.git@26680d5e249b249c7216ab2fed0ac8ed4ee285c5',