Add dummy dart:html library for documentation.

lib/html/doc/interface/SpeechRecognition.dartdoc

Index: lib/html/doc/interface/SpeechRecognition.dartdoc
diff --git a/lib/html/doc/interface/SpeechRecognition.dartdoc b/lib/html/doc/interface/SpeechRecognition.dartdoc
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// WARNING:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName SpeechRecognition
+interface SpeechRecognition extends EventTarget default _SpeechRecognitionFactoryProvider {
+
+  SpeechRecognition();
+
+  /**
+   * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
+   */
+  SpeechRecognitionEvents get on();
+
+  /** @domName SpeechRecognition.continuous */
+  bool continuous;
+
+  /** @domName SpeechRecognition.grammars */
+  SpeechGrammarList grammars;
+
+  /** @domName SpeechRecognition.lang */
+  String lang;
+
+  /** @domName SpeechRecognition.abort */
+  void abort();
+
+  /** @domName SpeechRecognition.addEventListener */
+  void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
+
+  /** @domName SpeechRecognition.dispatchEvent */
+  bool $dom_dispatchEvent(Event evt);
+
+  /** @domName SpeechRecognition.removeEventListener */
+  void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
+
+  /** @domName SpeechRecognition.start */
+  void start();
+
+  /** @domName SpeechRecognition.stop */
+  void stop();
+}
+
+interface SpeechRecognitionEvents extends Events {
+
+  EventListenerList get audioEnd();
+
+  EventListenerList get audioStart();
+
+  EventListenerList get end();
+
+  EventListenerList get error();
+
+  EventListenerList get noMatch();
+
+  EventListenerList get result();
+
+  EventListenerList get resultDeleted();
+
+  EventListenerList get soundEnd();
+
+  EventListenerList get soundStart();
+
+  EventListenerList get speechEnd();
+
+  EventListenerList get speechStart();
+
+  EventListenerList get start();
+}