Add Pause and Resume to Web TTS & Extension TTS APIs

chrome/browser/speech/tts_platform.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_
 #define CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_
 
 #include <string>
 
 #include "chrome/browser/speech/tts_controller.h"
@@ skipping 31 matching lines @@
   // Stop speaking immediately and return true on success.
   virtual bool StopSpeaking() = 0;
 
   // Returns whether any speech is on going.
   virtual bool IsSpeaking() = 0;
 
   // Append information about voices provided by this platform implementation
   // to |out_voices|.
   virtual void GetVoices(std::vector<VoiceData>* out_voices) = 0;
 
+  // Pause the current utterance, if any, until a call to Resume,
+  // Speak, or StopSpeaking.
+  virtual void Pause() = 0;
+
+  // Resume speaking the current utterance, if it was paused.
+  virtual void Resume() = 0;
+
   virtual std::string error();
   virtual void clear_error();
   virtual void set_error(const std::string& error);
 
  protected:
   TtsPlatformImpl() {}
 
   // On some platforms this may be a leaky singleton - do not rely on the
   // destructor being called!  http://crbug.com/122026
   virtual ~TtsPlatformImpl() {}
 
   std::string error_;
 
   DISALLOW_COPY_AND_ASSIGN(TtsPlatformImpl);
 };
 
 #endif  // CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_