Add File.readAsBytesSync/writeAsBytesSync() methods.

pkg/analyzer/test/file_system/physical_resource_provider_test.dart

Index: pkg/analyzer/test/file_system/physical_resource_provider_test.dart
diff --git a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
index 850bbcf3fecc6f3814e89aa7a485e21a9a4cfb5f..ff0a308a1d096ca5823b48dd4b0fc209033d0649 100644
--- a/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
+++ b/pkg/analyzer/test/file_system/physical_resource_provider_test.dart
@@ -20,9 +20,11 @@ import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  runReflectiveTests(PhysicalResourceProviderTest);
-  runReflectiveTests(FileTest);
-  runReflectiveTests(FolderTest);
+  if (!new bool.fromEnvironment('skipPhysicalResourceProviderTests')) {
+    runReflectiveTests(PhysicalResourceProviderTest);
+    runReflectiveTests(FileTest);
+    runReflectiveTests(FolderTest);
+  }
 }
 
 var _isFile = new isInstanceOf<File>();
@@ -104,6 +106,19 @@ class FileTest extends _BaseTest {
     expect(parent.path, equals(tempPath));
   }
 
+  void test_readAsBytesSync_doesNotExist() {
+    File file = PhysicalResourceProvider.INSTANCE.getResource('/test.bin');
+    expect(() {
+      file.readAsBytesSync();
+    }, throwsA(_isFileSystemException));
+  }
+
+  void test_readAsBytesSync_exists() {
+    List<int> bytes = <int>[1, 2, 3, 4, 5];
+    new io.File(path).writeAsBytesSync(bytes);
+    expect(file.readAsBytesSync(), bytes);
+  }
+
   void test_readAsStringSync_doesNotExist() {
     File file = PhysicalResourceProvider.INSTANCE.getResource(path);
     expect(() {
@@ -124,6 +139,14 @@ class FileTest extends _BaseTest {
   void test_toString() {
     expect(file.toString(), path);
   }
+
+  void test_writeAsBytesSync() {
+    new io.File(path).writeAsBytesSync(<int>[1, 2]);
+    expect(file.readAsBytesSync(), <int>[1, 2]);
+    // write new bytes
+    file.writeAsBytesSync(<int>[10, 20]);
+    expect(file.readAsBytesSync(), <int>[10, 20]);
+  }
 }
 
 @reflectiveTest