Add Pause and Resume to Web TTS & Extension TTS APIs

chrome/browser/speech/tts_win.cc

Index: chrome/browser/speech/tts_win.cc
diff --git a/chrome/browser/speech/tts_win.cc b/chrome/browser/speech/tts_win.cc
index 06a16f599d75141a77504ebbb6a1b94741065339..bfa28743165922a524b03ccb4c98f1eb0717e572 100644
--- a/chrome/browser/speech/tts_win.cc
+++ b/chrome/browser/speech/tts_win.cc
@@ -28,6 +28,10 @@ class TtsPlatformImplWin : public TtsPlatformImpl {
 
   virtual bool StopSpeaking();
 
+  virtual void Pause();
+
+  virtual void Resume();
+
   virtual bool IsSpeaking();
 
   virtual void GetVoices(std::vector<VoiceData>* out_voices) OVERRIDE;
@@ -51,6 +55,7 @@ class TtsPlatformImplWin : public TtsPlatformImpl {
   int prefix_len_;
   ULONG stream_number_;
   int char_position_;
+  bool paused_;
 
   friend struct DefaultSingletonTraits<TtsPlatformImplWin>;
 
@@ -125,10 +130,32 @@ bool TtsPlatformImplWin::StopSpeaking() {
       // Stop speech by speaking the empty string with the purge flag.
       speech_synthesizer_->Speak(L"", SPF_ASYNC | SPF_PURGEBEFORESPEAK, NULL);
     }
+    if (paused_) {
+      speech_synthesizer_->Resume();
+      paused_ = false;
+    }
   }
   return true;
 }
 
+void TtsPlatformImplWin::Pause() {
+  if (speech_synthesizer_.get() && utterance_id_ && !paused_) {
+    speech_synthesizer_->Pause();
+    paused_ = true;
+    TtsController::GetInstance()->OnTtsEvent(
+        utterance_id_, TTS_EVENT_PAUSE, char_position_, "");
+  }
+}
+
+void TtsPlatformImplWin::Resume() {
+  if (speech_synthesizer_.get() && utterance_id_ && paused_) {
+    speech_synthesizer_->Resume();
+    paused_ = false;
+    TtsController::GetInstance()->OnTtsEvent(
+        utterance_id_, TTS_EVENT_RESUME, char_position_, "");
+  }
+}
+
 bool TtsPlatformImplWin::IsSpeaking() {
   if (speech_synthesizer_.get()) {
     SPVOICESTATUS status;
@@ -156,6 +183,8 @@ void TtsPlatformImplWin::GetVoices(
   voice.events.insert(TTS_EVENT_MARKER);
   voice.events.insert(TTS_EVENT_WORD);
   voice.events.insert(TTS_EVENT_SENTENCE);
+  voice.events.insert(TTS_EVENT_PAUSE);
+  voice.events.insert(TTS_EVENT_RESUME);
 }
 
 void TtsPlatformImplWin::OnSpeechEvent() {
@@ -199,7 +228,8 @@ TtsPlatformImplWin::TtsPlatformImplWin()
   : utterance_id_(0),
     prefix_len_(0),
     stream_number_(0),
-    char_position_(0) {
+    char_position_(0),
+    paused_(false) {
   speech_synthesizer_.CreateInstance(CLSID_SpVoice);
   if (speech_synthesizer_.get()) {
     ULONGLONG event_mask =