[flutter_tools] split cache into API and implementation (#79580)

packages/flutter_tools/lib/src/context_runner.dart

@@ -39,6 +39,7 @@ import 'doctor.dart';
 import 'emulator.dart';
 import 'features.dart';
 import 'flutter_application_package.dart';
+import 'flutter_cache.dart';
 import 'flutter_device_manager.dart';
 import 'flutter_features.dart';
 import 'fuchsia/fuchsia_device.dart' show FuchsiaDeviceTools;
@@ -145,7 +146,7 @@ Future<T> runInContext<T>(
         logger: globals.logger,
         platform: globals.platform,
       ),
-      Cache: () => Cache(
+      Cache: () => FlutterCache(
         fileSystem: globals.fs,
         logger: globals.logger,
         platform: globals.platform,

packages/flutter_tools/lib/src/runner/flutter_command_runner.dart

@@ -22,12 +22,6 @@ import '../globals.dart' as globals;
 import '../tester/flutter_tester.dart';
 import '../web/web_device.dart';
 
-const String kFlutterRootEnvironmentVariableName = 'FLUTTER_ROOT'; // should point to //flutter/ (root of flutter/flutter repo)
-const String kFlutterEngineEnvironmentVariableName = 'FLUTTER_ENGINE'; // should point to //engine/src/ (root of flutter/engine repo)
-const String kSnapshotFileName = 'flutter_tools.snapshot'; // in //flutter/bin/cache/
-const String kFlutterToolsScriptFileName = 'flutter_tools.dart'; // in //flutter/packages/flutter_tools/bin/
-const String kFlutterEnginePackageName = 'sky_engine';
-
 class FlutterCommandRunner extends CommandRunner<void> {
   FlutterCommandRunner({ bool verboseHelp = false }) : super(
     'flutter',

packages/flutter_tools/lib/src/runner/local_engine.dart

@@ -13,8 +13,8 @@ import '../base/file_system.dart';
 import '../base/logger.dart';
 import '../base/platform.dart';
 import '../base/user_messages.dart' hide userMessages;
+import '../cache.dart';
 import '../dart/package_map.dart';
-import 'flutter_command_runner.dart';
 
 /// A strategy for locating the out/ directory of a local engine build.
 ///

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

@@ -33,6 +33,7 @@ void main() {
         platform: platform,
         logger: BufferLogger.test(),
         osUtils: FakeOperatingSystemUtils(),
+        artifacts: <ArtifactSet>[],
       );
       artifacts = CachedArtifacts(
         fileSystem: fileSystem,
@@ -187,6 +188,7 @@ void main() {
         platform: platform,
         logger: BufferLogger.test(),
         osUtils: FakeOperatingSystemUtils(),
+        artifacts: <ArtifactSet>[],
       );
       artifacts = LocalEngineArtifacts(
         fileSystem.path.join(fileSystem.currentDirectory.path, 'out', 'android_debug_unopt'),

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

@@ -16,6 +16,7 @@ import 'package:flutter_tools/src/base/os.dart';
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/dart/pub.dart';
+import 'package:flutter_tools/src/flutter_cache.dart';
 import 'package:meta/meta.dart';
 import 'package:mockito/mockito.dart';
 

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

@@ -814,6 +814,7 @@ void _testInMemory(String description, Future<void> Function() testMethod) {
   transfer(Cache(
     fileSystem: globals.fs,
     logger: logger,
+    artifacts: <ArtifactSet>[],
     osUtils: OperatingSystemUtils(
       fileSystem: globals.fs,
       logger: logger,
@@ -858,6 +859,7 @@ void _testInMemory(String description, Future<void> Function() testMethod) {
         fileSystem: testFileSystem,
         osUtils: globals.os,
         platform: globals.platform,
+        artifacts: <ArtifactSet>[],
       ),
       FlutterProjectFactory: () => FlutterProjectFactory(
         fileSystem: testFileSystem,