gpu video: optimize HW video to SW canvas and implement it for WebRTC.

content/browser/media/capture/desktop_capture_device_aura.cc

 // Copyright 2013 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/media/capture/desktop_capture_device_aura.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/timer/timer.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 345 matching lines @@
     result->TakeTexture(&texture_mailbox, &release_callback);
     DCHECK(texture_mailbox.IsTexture());
     if (!texture_mailbox.IsTexture())
       return false;
     video_frame = media::VideoFrame::WrapNativeTexture(
         make_scoped_ptr(new gpu::MailboxHolder(texture_mailbox.mailbox(),
                                                texture_mailbox.target(),
                                                texture_mailbox.sync_point())),
         base::Bind(&RunSingleReleaseCallback, base::Passed(&release_callback)),
         result->size(), gfx::Rect(result->size()), result->size(),
-        base::TimeDelta(), media::VideoFrame::ReadPixelsCB(), false);
+        base::TimeDelta(), false);
     capture_frame_cb.Run(video_frame, start_time, true);
     return true;
   }
 
   // Compute the dest size we want after the letterboxing resize. Make the
   // coordinates and sizes even because we letterbox in YUV space
   // (see CopyRGBToVideoFrame). They need to be even for the UV samples to
   // line up correctly.
   // The video frame's coded_size() and the result's size() are both physical
   // pixels.
@@ skipping 155 matching lines @@
     scoped_ptr<Client> client) {
   DVLOG(1) << "Allocating " << params.requested_format.frame_size.ToString();
   core_->AllocateAndStart(params, client.Pass());
 }
 
 void DesktopCaptureDeviceAura::StopAndDeAllocate() {
   core_->StopAndDeAllocate();
 }
 
 }  // namespace content