Update Dart SDK to `1.19.0-dev.4.0`. (#5329)

bin/cache/dart-sdk.version

-1.19.0-dev.0.0
+1.19.0-dev.5.0

packages/flutter_test/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   # We don't actually depend on 'analyzer', but 'test' and 'flutter_tools' do.
   # We pin the version of analyzer we depend on to avoid version skew across our
   # packages.
-  analyzer: 0.27.4-alpha.19
+  analyzer: 0.27.5-alpha.0 
 
   flutter:
     path: ../flutter

packages/flutter_tools/lib/src/dart/analysis.dart

@@ -9,8 +9,9 @@ import 'package:analyzer/file_system/file_system.dart' as file_system;
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/plugin/options.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
-import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/source/error_processor.dart';
+import 'package:analyzer/src/context/builder.dart'; // ignore: implementation_imports
+import 'package:analyzer/src/dart/sdk/sdk.dart'; // ignore: implementation_imports
 import 'package:analyzer/src/generated/engine.dart'; // ignore: implementation_imports
 import 'package:analyzer/src/generated/error.dart'; // ignore: implementation_imports
 import 'package:analyzer/src/generated/java_io.dart'; // ignore: implementation_imports
@@ -99,7 +100,7 @@ class AnalysisDriver {
     EmbedderYamlLocator locator = new EmbedderYamlLocator(packageMap);
     if (locator.embedderYamls.isNotEmpty) {
       // Create and configure an embedded SDK.
-      EmbedderSdk sdk = new EmbedderSdk(locator.embedderYamls);
+      EmbedderSdk sdk = new EmbedderSdk(PhysicalResourceProvider.INSTANCE, locator.embedderYamls);
       // Fail fast if no URI mappings are found.
       assert(sdk.libraryMap.size() > 0);
       sdk.analysisOptions = context.analysisOptions;

packages/flutter_tools/pubspec.yaml

@@ -39,7 +39,7 @@ dependencies:
   test: 0.12.15+1
 
   # Pinned in flutter_test as well.
-  analyzer: 0.27.4-alpha.19
+  analyzer: 0.27.5-alpha.0
 
 dev_dependencies:
   mockito: ^0.11.0