Android implementation of text-to-speech code for Web Speech Synthesis API

chrome/browser/speech/tts_message_filter.cc

Index: chrome/browser/speech/tts_message_filter.cc
diff --git a/chrome/browser/speech/tts_message_filter.cc b/chrome/browser/speech/tts_message_filter.cc
index fb6bb2829ebfe1fc016649ea01cba0cc0ef3b1c5..c7dec7a420b9013a0580cfaa96e3a75dfac3b450 100644
--- a/chrome/browser/speech/tts_message_filter.cc
+++ b/chrome/browser/speech/tts_message_filter.cc
@@ -17,9 +17,7 @@ using content::BrowserThread;
 TtsMessageFilter::TtsMessageFilter(int render_process_id, Profile* profile)
     : render_process_id_(render_process_id),
       profile_(profile) {
-}
-
-TtsMessageFilter::~TtsMessageFilter() {
+  TtsController::GetInstance()->AddVoicesChangedDelegate(this);
 }
 
 void TtsMessageFilter::OverrideThreadForMessage(
@@ -36,7 +34,7 @@ void TtsMessageFilter::OverrideThreadForMessage(
 }
 
 bool TtsMessageFilter::OnMessageReceived(const IPC::Message& message,
-                                                bool* message_was_ok) {
+                                         bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(TtsMessageFilter, message, *message_was_ok)
     IPC_MESSAGE_HANDLER(TtsHostMsg_InitializeVoiceList, OnInitializeVoiceList)
@@ -49,6 +47,10 @@ bool TtsMessageFilter::OnMessageReceived(const IPC::Message& message,
   return handled;
 }
 
+void TtsMessageFilter::OnChannelClosing() {
+  TtsController::GetInstance()->RemoveVoicesChangedDelegate(this);
+}
+
 void TtsMessageFilter::OnInitializeVoiceList() {
   TtsController* tts_controller = TtsController::GetInstance();
   std::vector<VoiceData> voices;
@@ -130,3 +132,10 @@ void TtsMessageFilter::OnTtsEvent(Utterance* utterance,
       break;
   }
 }
+
+void TtsMessageFilter::OnVoicesChanged() {
+  OnInitializeVoiceList();
+}
+
+TtsMessageFilter::~TtsMessageFilter() {
+}