Allow MessageFilters to restrict listening to specific message classes

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 9ef511f22ede433209e728a88c5c56ef82c15a34..b782c77ba9c2521373c8603bf4ec0613573d59e6 100644
--- a/chrome/browser/speech/tts_message_filter.cc
+++ b/chrome/browser/speech/tts_message_filter.cc
@@ -14,8 +14,16 @@
 
 using content::BrowserThread;
 
+namespace {
+const uint32 kFilteredMessageClasses[] = {
+  TtsMsgStart
+};
+}  // namespace
+
 TtsMessageFilter::TtsMessageFilter(int render_process_id, Profile* profile)
-    : render_process_id_(render_process_id),
+    : BrowserMessageFilter(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)),
+      render_process_id_(render_process_id),
       profile_(profile) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   TtsController::GetInstance()->AddVoicesChangedDelegate(this);