Remove browser-side tracking of accelerated compositing

content/browser/media/capture/web_contents_video_capture_device.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.
 //
 // Implementation notes: This needs to work on a variety of hardware
 // configurations where the speed of the CPU and GPU greatly affect overall
 // performance. Spanning several threads, the process of capturing has been
 // split up into four conceptual stages:
 //
 //   1. Reserve Buffer: Before a frame can be captured, a slot in the client's
@@ skipping 404 matching lines @@
 
   // This message occurs on window resizes and visibility changes even when
   // accelerated compositing is active, so we need to filter out these cases.
   if (!rwh || !rwh->GetView())
     return;
   // Mac sends DID_UPDATE_BACKING_STORE messages to inform the capture system
   // of new software compositor frames, so always treat these messages as
   // signals of a new frame on Mac.
   // http://crbug.com/333986
 #if !defined(OS_MACOSX)
-  if (rwh->is_accelerated_compositing_active() &&
-      rwh->GetView()->IsSurfaceAvailableForCopy())
+  if (rwh->GetView()->IsSurfaceAvailableForCopy())
     return;
 #endif
 
   TRACE_EVENT1("mirroring", "ContentCaptureSubscription::Observe",
                "instance", this);
 
   base::Closure copy_done_callback;
   scoped_refptr<media::VideoFrame> frame;
   RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback deliver_frame_cb;
   const base::TimeTicks start_time = base::TimeTicks::Now();
@@ skipping 377 matching lines @@
     scoped_ptr<Client> client) {
   DVLOG(1) << "Allocating " << params.requested_format.frame_size.ToString();
   core_->AllocateAndStart(params, client.Pass());
 }
 
 void WebContentsVideoCaptureDevice::StopAndDeAllocate() {
   core_->StopAndDeAllocate();
 }
 
 }  // namespace content