Add Pause and Resume to Web TTS & Extension TTS APIs

chrome/browser/speech/tts_platform.h

Index: chrome/browser/speech/tts_platform.h
diff --git a/chrome/browser/speech/tts_platform.h b/chrome/browser/speech/tts_platform.h
index c6b570687c259cc41958c84c5c76ffa110b9775f..4b57fd49e46bf735b14ff4139446e22096cb9a83 100644
--- a/chrome/browser/speech/tts_platform.h
+++ b/chrome/browser/speech/tts_platform.h
@@ -49,6 +49,13 @@ class TtsPlatformImpl {
   // 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);