[flutter_tools] include dart-defines in cached kernel name (#59083)

This prevents using a cached kernel file with different defines, since --initialize-from-dill does not handle this correctly.

Fixes #58976

packages/flutter_tools/lib/src/bundle.dart

@@ -4,6 +4,8 @@
 
 import 'dart:async';
 
+import 'package:convert/convert.dart';
+import 'package:crypto/crypto.dart';
 import 'package:meta/meta.dart';
 import 'package:pool/pool.dart';
 
@@ -17,6 +19,7 @@ import 'build_system/depfile.dart';
 import 'build_system/targets/common.dart';
 import 'build_system/targets/icon_tree_shaker.dart';
 import 'cache.dart';
+import 'convert.dart';
 import 'dart/package_map.dart';
 import 'devfs.dart';
 import 'globals.dart' as globals;
@@ -34,9 +37,20 @@ String getDefaultApplicationKernelPath({ @required bool trackWidgetCreation }) {
   );
 }
 
-String getDefaultCachedKernelPath({ @required bool trackWidgetCreation }) {
+String getDefaultCachedKernelPath({
+  @required bool trackWidgetCreation,
+  @required List<String> dartDefines,
+}) {
+  final StringBuffer buffer = StringBuffer();
+  buffer.writeAll(dartDefines);
+  String buildPrefix = '';
+  if (buffer.isNotEmpty) {
+    final String output = buffer.toString();
+    final Digest digest = md5.convert(utf8.encode(output));
+    buildPrefix = '${hex.encode(digest.bytes)}.';
+  }
   return getKernelPathForTransformerOptions(
-    globals.fs.path.join(getBuildDirectory(), 'cache.dill'),
+    globals.fs.path.join(getBuildDirectory(), '${buildPrefix}cache.dill'),
     trackWidgetCreation: trackWidgetCreation,
   );
 }

packages/flutter_tools/lib/src/resident_runner.dart

@@ -104,6 +104,7 @@ class FlutterDevice {
             globals.printTrace(message),
         initializeFromDill: getDefaultCachedKernelPath(
           trackWidgetCreation: buildInfo.trackWidgetCreation,
+          dartDefines: buildInfo.dartDefines,
         ),
         targetModel: TargetModel.dartdevc,
         extraFrontEndOptions: buildInfo.extraFrontEndOptions,
@@ -131,6 +132,7 @@ class FlutterDevice {
         extraFrontEndOptions: buildInfo.extraFrontEndOptions,
         initializeFromDill: getDefaultCachedKernelPath(
           trackWidgetCreation: buildInfo.trackWidgetCreation,
+          dartDefines: buildInfo.dartDefines,
         ),
         packagesPath: globalPackagesPath,
       );
@@ -1062,6 +1064,7 @@ abstract class ResidentRunner {
     if (outputDill.existsSync()) {
       final String copyPath = getDefaultCachedKernelPath(
         trackWidgetCreation: trackWidgetCreation,
+        dartDefines: debuggingOptions.buildInfo.dartDefines,
       );
       globals.fs
           .file(copyPath)

packages/flutter_tools/test/general.shard/resident_runner_test.dart

@@ -1165,6 +1165,40 @@ void main() {
     expect(await globals.fs.file(globals.fs.path.join('build', 'cache.dill')).readAsString(), 'ABC');
   }));
 
+  testUsingContext('HotRunner copies compiled app.dill to cache during startup with dart defines', () => testbed.run(() async {
+    fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
+      listViews,
+      listViews,
+    ]);
+    setWsAddress(testUri, fakeVmServiceHost.vmService);
+    globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
+    residentRunner = HotRunner(
+      <FlutterDevice>[
+        mockFlutterDevice,
+      ],
+      stayResident: false,
+      debuggingOptions: DebuggingOptions.enabled(
+        const BuildInfo(
+          BuildMode.debug,
+          '',
+          treeShakeIcons: false,
+          dartDefines: <String>['a', 'b'],
+        )
+      ),
+    );
+    residentRunner.artifactDirectory.childFile('app.dill').writeAsStringSync('ABC');
+    when(mockFlutterDevice.runHot(
+      hotRunner: anyNamed('hotRunner'),
+      route: anyNamed('route'),
+    )).thenAnswer((Invocation invocation) async {
+      return 0;
+    });
+    await residentRunner.run();
+
+    expect(await globals.fs.file(globals.fs.path.join(
+      'build', '187ef4436122d1cc2f40dc2b92f0eba0.cache.dill')).readAsString(), 'ABC');
+  }));
+
   testUsingContext('HotRunner does not copy app.dill if a dillOutputPath is given', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,