[dartdevc,nnbd] analyze whole sdk, fix isolate errors

This should fix all ddc isolate errors.  Remaining two io/_http errors are due to:
https://github.com/dart-lang/sdk/issues/40482

The rest are mirrors.  Do we think we'll be able to remove it altogether?  If not,
I can take a pass to fix.

Change-Id: I4cef9773b5fa36490bdfbc08a06fae6cd80c5eae
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134860
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>

pkg/dev_compiler/tool/check_nnbd_sdk.dart

@@ -46,11 +46,60 @@ void main(List<String> argv) {
     '--nnbd',
   ]);
 
-  var emptyProgramUri = baseUri.resolve('empty_program.dart');
-  File.fromUri(emptyProgramUri).writeAsStringSync('''
+  var isWeb = false;
+  var isNative = false;
+  switch (target) {
+    case 'dartdevc':
+    case 'dart2js':
+      isWeb = true;
+      break;
+    case 'flutter':
+    case 'vm':
+      isNative = true;
+      break;
+  }
+
+  var core = '''
+import 'dart:async';
+import 'dart:collection';
+import 'dart:convert';
+import 'dart:core';
+import 'dart:developer';
+import 'dart:math';
+import 'dart:typed_data';
+''';
+
+  var web = !isWeb
+      ? ''
+      : '''
 import 'dart:js';
 import 'dart:js_util';
+import 'dart:indexed_db';
 import 'dart:html';
+import 'dart:html_common';
+import 'dart:svg';
+import 'dart:web_audio';
+import 'dart:web_gl';
+import 'dart:web_sql';
+''';
+
+  var native = !isNative
+      ? '''
+import 'dart:io';
+import 'dart:isolate';
+'''
+      : '''
+import 'dart:ffi';
+import 'dart:io';
+import 'dart:isolate';
+import 'dart:mirrors';
+''';
+
+  var emptyProgramUri = baseUri.resolve('empty_program.dart');
+  File.fromUri(emptyProgramUri).writeAsStringSync('''
+$core
+$web
+$native
 
 main() {}
 ''');

pkg/dev_compiler/tool/dartdevc_nnbd_sdk_error_golden.txt

@@ -1 +1,2 @@
-
+ERROR|STATIC_WARNING|UNCHECKED_USE_OF_NULLABLE_VALUE|lib/_http/http.dart|7638|7|11|The expression is nullable and must be null-checked before it can be used.
+ERROR|STATIC_WARNING|UNCHECKED_USE_OF_NULLABLE_VALUE|lib/_http/http.dart|8726|5|24|The expression is nullable and must be null-checked before it can be used.

sdk_nnbd/lib/_internal/js_dev_runtime/patch/isolate_patch.dart

@@ -43,7 +43,7 @@ class Isolate {
           bool errorsAreFatal = true,
           bool? checked,
           Map<String, String>? environment,
-          Uri packageRoot,
+          Uri? packageRoot,
           Uri? packageConfig,
           bool automaticPackageResolution = false,
           String? debugName}) =>
@@ -69,7 +69,7 @@ class Isolate {
   void kill({int priority = beforeNextEvent}) => _unsupported();
   @patch
   void ping(SendPort responsePort,
-          {Object response, int priority = immediate}) =>
+          {Object? response, int priority = immediate}) =>
       _unsupported();
 
   @patch
@@ -101,7 +101,7 @@ class _ReceivePort extends Stream implements ReceivePort {
   StreamSubscription listen(void Function(dynamic)? onData,
           {Function? onError,
           void Function()? onDone,
-          bool cancelOnError = true}) =>
+          bool? cancelOnError = true}) =>
       _unsupported();
 }