Adding supported checks & test for SpeechRecognition APIs.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index fff74cc325a7550d88d63b927119794220e4bc14..eff218150a0dbc3bd29ef103dd85a68427c7a9d6 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -22061,6 +22061,8 @@ class SpeechInputResult extends NativeFieldWrapperClass1 {
 
 @DocsEditable
 @DomName('SpeechRecognition')
+@SupportedBrowser(SupportedBrowser.CHROME, '25')
+@Experimental()
 class SpeechRecognition extends EventTarget {
   SpeechRecognition.internal() : super.internal();
 
@@ -22112,6 +22114,9 @@ class SpeechRecognition extends EventTarget {
   factory SpeechRecognition() => SpeechRecognition._create();
   static SpeechRecognition _create() native "SpeechRecognition_constructor_Callback";
 
+  /// Checks if this type is supported on the current platform.
+  static bool get supported => true;
+
   @DocsEditable
   @DomName('EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent')
   SpeechRecognitionEvents get on =>
@@ -22274,6 +22279,8 @@ class SpeechRecognitionEvents extends Events {
 
 @DocsEditable
 @DomName('SpeechRecognitionAlternative')
+@SupportedBrowser(SupportedBrowser.CHROME, '25')
+@Experimental()
 class SpeechRecognitionAlternative extends NativeFieldWrapperClass1 {
   SpeechRecognitionAlternative.internal();
 
@@ -22295,6 +22302,8 @@ class SpeechRecognitionAlternative extends NativeFieldWrapperClass1 {
 
 @DocsEditable
 @DomName('SpeechRecognitionError')
+@SupportedBrowser(SupportedBrowser.CHROME, '25')
+@Experimental()
 class SpeechRecognitionError extends Event {
   SpeechRecognitionError.internal() : super.internal();
 
@@ -22316,6 +22325,8 @@ class SpeechRecognitionError extends Event {
 
 @DocsEditable
 @DomName('SpeechRecognitionEvent')
+@SupportedBrowser(SupportedBrowser.CHROME, '25')
+@Experimental()
 class SpeechRecognitionEvent extends Event {
   SpeechRecognitionEvent.internal() : super.internal();
 
@@ -22345,6 +22356,8 @@ class SpeechRecognitionEvent extends Event {
 
 @DocsEditable
 @DomName('SpeechRecognitionResult')
+@SupportedBrowser(SupportedBrowser.CHROME, '25')
+@Experimental()
 class SpeechRecognitionResult extends NativeFieldWrapperClass1 {
   SpeechRecognitionResult.internal();