Adding supported checks to websql.

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 f44afd146552ce267ea00d3b632645a75c37de58..b3c6ff345ec1ff7d02d62135b083caeb6670a3e4 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -6622,9 +6622,15 @@ class DataView extends ArrayBufferView {
 
 @DocsEditable
 @DomName('Database')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.SAFARI)
+@Experimental
 class Database extends NativeFieldWrapperClass1 {
   Database.internal();
 
+  /// Checks if this type is supported on the current platform.
+  static bool get supported => true;
+
   @DomName('Database.version')
   @DocsEditable
   String get version native "Database_version_Getter";
@@ -6659,6 +6665,9 @@ typedef void DatabaseCallback(database);
 
 @DocsEditable
 @DomName('DatabaseSync')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.SAFARI)
+@Experimental
 class DatabaseSync extends NativeFieldWrapperClass1 {
   DatabaseSync.internal();
 
@@ -22757,6 +22766,9 @@ class SqlResultSetRowList extends NativeFieldWrapperClass1 implements List<Map>
 
 @DocsEditable
 @DomName('SQLTransaction')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.SAFARI)
+@Experimental
 class SqlTransaction extends NativeFieldWrapperClass1 {
   SqlTransaction.internal();
 
@@ -22774,6 +22786,9 @@ class SqlTransaction extends NativeFieldWrapperClass1 {
 
 @DocsEditable
 @DomName('SQLTransactionSync')
+@SupportedBrowser(SupportedBrowser.CHROME)
+@SupportedBrowser(SupportedBrowser.SAFARI)
+@Experimental
 class SqlTransactionSync extends NativeFieldWrapperClass1 {
   SqlTransactionSync.internal();
 
@@ -28349,6 +28364,9 @@ class Window extends EventTarget implements WindowBase {
 
   @DomName('DOMWindow.openDatabase')
   @DocsEditable
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @SupportedBrowser(SupportedBrowser.SAFARI)
+  @Experimental
   Database openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]) native "DOMWindow_openDatabase_Callback";
 
   @DomName('DOMWindow.postMessage')
@@ -29006,10 +29024,16 @@ class WorkerContext extends EventTarget {
 
   @DomName('WorkerContext.openDatabase')
   @DocsEditable
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @SupportedBrowser(SupportedBrowser.SAFARI)
+  @Experimental
   Database openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]) native "WorkerContext_openDatabase_Callback";
 
   @DomName('WorkerContext.openDatabaseSync')
   @DocsEditable
+  @SupportedBrowser(SupportedBrowser.CHROME)
+  @SupportedBrowser(SupportedBrowser.SAFARI)
+  @Experimental
   DatabaseSync openDatabaseSync(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]) native "WorkerContext_openDatabaseSync_Callback";
 
   @DomName('WorkerContext.removeEventListener')