Implement web speech synthesis.

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index d8392f414af7d4de754d11bff31d3eedf31cfb29..4684c5fa5c867647421463cecc0f6a4da4ff221b 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -34,6 +34,7 @@
 #include "content/renderer/media/renderer_webaudiodevice_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "content/renderer/renderer_clipboard_client.h"
+#include "content/renderer/tts_dispatcher.h"
 #include "content/renderer/websharedworkerrepository_impl.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_sync_message_filter.h"
@@ -848,6 +849,14 @@ WebKit::WebHyphenator* RendererWebKitPlatformSupportImpl::hyphenator() {
 
 //------------------------------------------------------------------------------
 
+WebKit::WebSpeechSynthesizer*
+RendererWebKitPlatformSupportImpl::createSpeechSynthesizer(
+    WebKit::WebSpeechSynthesizerClient* client) {
+  return new TtsDispatcher(client);
+}
+
+//------------------------------------------------------------------------------
+
 bool RendererWebKitPlatformSupportImpl::processMemorySizesInBytes(
     size_t* private_bytes, size_t* shared_bytes) {
   content::RenderThread::Get()->Send(