[web] Add --local-web-sdk flag and use precompiled platform kernels for dart2js and ddc (#114639)

* Dart2JS build step looks for compiled platform binaries.

* Use new locations of platform binaries.

* Added --local-web-sdk command line flag.

* Need to use the matching frontend server when doing ddc stuff.

* Update packages/flutter_tools/lib/src/test/web_test_compiler.dart

Co-authored-by: Mouad Debbar <[email protected]>

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

Co-authored-by: Mouad Debbar <[email protected]>

* Formatting issues.

* Need to use URI format for platform dill.

* Fix resident runner tests.

* Fix analysis issue.

* Fix and add unit tests.

* Add some useful comments.

* Refine doc comments for flags.

Co-authored-by: Mouad Debbar <[email protected]>

Author: eyebrowsoffire

packages/flutter_tools/lib/src/android/gradle.dart

@@ -277,22 +277,22 @@ class AndroidGradleBuilder implements AndroidBuilder {
     if (!buildInfo.androidGradleDaemon) {
       command.add('--no-daemon');
     }
-    if (_artifacts is LocalEngineArtifacts) {
-      final LocalEngineArtifacts localEngineArtifacts = _artifacts as LocalEngineArtifacts;
+    final LocalEngineInfo? localEngineInfo = _artifacts.localEngineInfo;
+    if (localEngineInfo != null) {
       final Directory localEngineRepo = _getLocalEngineRepo(
-        engineOutPath: localEngineArtifacts.engineOutPath,
+        engineOutPath: localEngineInfo.engineOutPath,
         androidBuildInfo: androidBuildInfo,
         fileSystem: _fileSystem,
       );
       _logger.printTrace(
-          'Using local engine: ${localEngineArtifacts.engineOutPath}\n'
+          'Using local engine: ${localEngineInfo.engineOutPath}\n'
               'Local Maven repo: ${localEngineRepo.path}'
       );
       command.add('-Plocal-engine-repo=${localEngineRepo.path}');
       command.add('-Plocal-engine-build-mode=${buildInfo.modeName}');
-      command.add('-Plocal-engine-out=${localEngineArtifacts.engineOutPath}');
+      command.add('-Plocal-engine-out=${localEngineInfo.engineOutPath}');
       command.add('-Ptarget-platform=${_getTargetPlatformByLocalEnginePath(
-          localEngineArtifacts.engineOutPath)}');
+          localEngineInfo.engineOutPath)}');
     } else if (androidBuildInfo.targetArchs.isNotEmpty) {
       final String targetPlatforms = androidBuildInfo
           .targetArchs
@@ -611,20 +611,20 @@ class AndroidGradleBuilder implements AndroidBuilder {
       );
     }
 
-    if (_artifacts is LocalEngineArtifacts) {
-      final LocalEngineArtifacts localEngineArtifacts = _artifacts as LocalEngineArtifacts;
+    final LocalEngineInfo? localEngineInfo = _artifacts.localEngineInfo;
+    if (localEngineInfo != null) {
       final Directory localEngineRepo = _getLocalEngineRepo(
-        engineOutPath: localEngineArtifacts.engineOutPath,
+        engineOutPath: localEngineInfo.engineOutPath,
         androidBuildInfo: androidBuildInfo,
         fileSystem: _fileSystem,
       );
       _logger.printTrace(
-        'Using local engine: ${localEngineArtifacts.engineOutPath}\n'
+        'Using local engine: ${localEngineInfo.engineOutPath}\n'
         'Local Maven repo: ${localEngineRepo.path}'
       );
       command.add('-Plocal-engine-repo=${localEngineRepo.path}');
       command.add('-Plocal-engine-build-mode=${buildInfo.modeName}');
-      command.add('-Plocal-engine-out=${localEngineArtifacts.engineOutPath}');
+      command.add('-Plocal-engine-out=${localEngineInfo.engineOutPath}');
 
       // Copy the local engine repo in the output directory.
       try {
@@ -639,7 +639,7 @@ class AndroidGradleBuilder implements AndroidBuilder {
         );
       }
       command.add('-Ptarget-platform=${_getTargetPlatformByLocalEnginePath(
-          localEngineArtifacts.engineOutPath)}');
+          localEngineInfo.engineOutPath)}');
     } else if (androidBuildInfo.targetArchs.isNotEmpty) {
       final String targetPlatforms = androidBuildInfo.targetArchs
           .map(getPlatformNameForAndroidArch).join(',');