create one video capture message filter per renderer process

content/renderer/render_thread.cc

Index: content/renderer/render_thread.cc
===================================================================
--- content/renderer/render_thread.cc	(revision 88354)
+++ content/renderer/render_thread.cc	(working copy)
@@ -44,6 +44,8 @@
 #include "content/renderer/render_view_visitor.h"
 #include "content/renderer/renderer_webidbfactory_impl.h"
 #include "content/renderer/renderer_webkitclient_impl.h"
+#include "content/renderer/video_capture_message_filter.h"
+#include "content/renderer/video_capture_message_filter_creator.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_platform_file.h"
 #include "net/base/net_errors.h"
@@ -167,6 +169,10 @@
   db_message_filter_ = new DBMessageFilter();
   AddFilter(db_message_filter_.get());
 
+  VideoCaptureMessageFilter* video_capture_message_filter =
+      VideoCaptureMessageFilterCreator::SharedFilter();
+  AddFilter(video_capture_message_filter);
+
   content::GetContentClient()->renderer()->RenderThreadStarted();
 
   TRACE_EVENT_END_ETW("RenderThread::Init", 0, "");
@@ -184,6 +190,10 @@
   RemoveFilter(db_message_filter_.get());
   db_message_filter_ = NULL;
 
+  VideoCaptureMessageFilter* video_capture_message_filter =
+      VideoCaptureMessageFilterCreator::SharedFilter();
+  RemoveFilter(video_capture_message_filter);
+
   // Shutdown the file thread if it's running.
   if (file_thread_.get())
     file_thread_->Stop();