Allow MessageFilters to restrict listening to specific message classes

content/browser/renderer_host/media/video_capture_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/media/video_capture_host.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 #include "content/common/media/video_capture_messages.h"
 
 namespace content {
+namespace {
+const uint32 kFilteredMessageClasses[] = {
+  VideoCaptureMsgStart
+};
+}  // namespace
 
 VideoCaptureHost::VideoCaptureHost(MediaStreamManager* media_stream_manager)
-    : media_stream_manager_(media_stream_manager) {
+    : BrowserMessageFilter(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)),
+      media_stream_manager_(media_stream_manager) {
 }
 
 VideoCaptureHost::~VideoCaptureHost() {}
 
 void VideoCaptureHost::OnChannelClosing() {
   // Since the IPC channel is gone, close all requested VideoCaptureDevices.
   for (EntryMap::iterator it = entries_.begin(); it != entries_.end(); ) {
     const base::WeakPtr<VideoCaptureController>& controller = it->second;
     if (controller) {
       VideoCaptureControllerID controller_id(it->first);
@@ skipping 284 matching lines @@
     return;
 
   if (it->second) {
     media_stream_manager_->video_capture_manager()->StopCaptureForClient(
         it->second.get(), controller_id, this);
   }
   entries_.erase(it);
 }
 
 }  // namespace content