Undo mistaken revert.

content/renderer/video_capture_message_filter.h

Index: content/renderer/video_capture_message_filter.h
diff --git a/content/renderer/video_capture_message_filter.h b/content/renderer/video_capture_message_filter.h
index 2a885e9bb0383968be522794fa1718e065695492..c476616495a3b75770dc4073f594462fbc7e1536 100644
--- a/content/renderer/video_capture_message_filter.h
+++ b/content/renderer/video_capture_message_filter.h
@@ -34,6 +34,10 @@ class VideoCaptureMessageFilter : public IPC::ChannelProxy::MessageFilter {
     virtual void OnDeviceInfoReceived(
         const media::VideoCaptureParams& device_info) = 0;
 
+    // Called when the delegate has been added to filter's delegate list.
+    // |device_id| is the device id for the delegate.
+    virtual void OnDelegateAdded(int32 device_id) = 0;
+
    protected:
     virtual ~Delegate() {}
   };
@@ -41,14 +45,14 @@ class VideoCaptureMessageFilter : public IPC::ChannelProxy::MessageFilter {
   explicit VideoCaptureMessageFilter(int32 route_id);
   virtual ~VideoCaptureMessageFilter();
 
-  // Add a delegate to the map and return id of the entry.
-  int32 AddDelegate(Delegate* delegate);
+  // Add a delegate to the map.
+  void AddDelegate(Delegate* delegate);
 
   // Remove a delegate from the map.
   void RemoveDelegate(Delegate* delegate);
 
   // Send a message asynchronously.
-  bool Send(IPC::Message* message);
+  virtual bool Send(IPC::Message* message);
 
   void AddFilter();
 
@@ -79,6 +83,7 @@ class VideoCaptureMessageFilter : public IPC::ChannelProxy::MessageFilter {
 
   // A map of device ids to delegates.
   Delegates delegates_;
+  Delegates pending_delegates_;
   int32 last_device_id_;
 
   int32 route_id_;