RESOURCE_UTILIZATION in VideoFrameMetadata, a consumer feedback signal.

content/renderer/media/video_capture_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
 
 #include <list>
 #include <map>
 
@@ skipping 111 matching lines @@
   void OnDeviceSupportedFormatsEnumerated(
       const media::VideoCaptureFormats& supported_formats) override;
   void OnDeviceFormatsInUseReceived(
       const media::VideoCaptureFormats& formats_in_use) override;
   void OnDelegateAdded(int32 device_id) override;
 
   // Sends an IPC message to browser process when all clients are done with the
   // buffer.
   void OnClientBufferFinished(int buffer_id,
                               const scoped_refptr<ClientBuffer>& buffer,
-                              uint32 release_sync_point);
+                              uint32 release_sync_point,
+                              double consumer_resource_utilization);
 
   void StopDevice();
   void RestartCapture();
   void StartCaptureInternal();
 
   virtual void Send(IPC::Message* message);
 
   // Helpers.
   bool RemoveClient(int client_id, ClientInfoMap* clients);
 
+  // Called (by an unknown thread) when all consumers are done with a VideoFrame
+  // and its ref-count has gone to zero.  This helper function grabs the
+  // RESOURCE_UTILIZATION value from the |metadata| and then runs the given
+  // callback, to trampoline back to the IO thread with the values.
+  static void DidFinishConsumingFrame(
+    const media::VideoFrameMetadata* metadata,
+    uint32* release_sync_point_storage,  // Takes ownership.
+    const base::Callback<void(uint32, double)>& callback_to_io_thread);
+
   const scoped_refptr<VideoCaptureMessageFilter> message_filter_;
   int device_id_;
   const int session_id_;
 
   // Vector of callbacks to be notified of device format enumerations, used only
   // on IO Thread.
   std::vector<VideoCaptureDeviceFormatsCB> device_formats_cb_queue_;
   // Vector of callbacks to be notified of a device's in use capture format(s),
   // used only on IO Thread.
   std::vector<VideoCaptureDeviceFormatsCB> device_formats_in_use_cb_queue_;
@@ skipping 24 matching lines @@
   // in |client_buffers_|.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoCaptureImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_