"Buttery Smooth" Tab Capture.

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 196 matching lines @@
   UpdateCaptureSize();
 
   // Start observing window events.
   desktop_window_->AddObserver(this);
 
   // Start observing compositor updates.
   if (desktop_window_->GetHost())
     desktop_window_->GetHost()->compositor()->AddObserver(this);
 
   // Starts timer.
-  timer_.Start(FROM_HERE, oracle_proxy_->capture_period(),
+  timer_.Start(FROM_HERE, oracle_proxy_->min_capture_period(),
                base::Bind(&DesktopVideoCaptureMachine::Capture, AsWeakPtr(),
                           false));
 
   started_ = true;
   return true;
 }
 
 void DesktopVideoCaptureMachine::Stop(const base::Closure& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ skipping 31 matching lines @@
     return;
 
   scoped_refptr<media::VideoFrame> frame;
   ThreadSafeCaptureOracle::CaptureFrameCallback capture_frame_cb;
 
   const base::TimeTicks start_time = base::TimeTicks::Now();
   const VideoCaptureOracle::Event event =
       dirty ? VideoCaptureOracle::kCompositorUpdate
             : VideoCaptureOracle::kTimerPoll;
   if (oracle_proxy_->ObserveEventAndDecideCapture(
-      event, start_time, &frame, &capture_frame_cb)) {
+          event, gfx::Rect(), start_time, &frame, &capture_frame_cb)) {
     scoped_ptr<cc::CopyOutputRequest> request =
         cc::CopyOutputRequest::CreateRequest(
             base::Bind(&DesktopVideoCaptureMachine::DidCopyOutput,
                        AsWeakPtr(), frame, start_time, capture_frame_cb));
     gfx::Rect window_rect =
         ui::ConvertRectToPixel(desktop_window_->layer(),
                                gfx::Rect(desktop_window_->bounds().width(),
                                          desktop_window_->bounds().height()));
     request->set_area(window_rect);
     desktop_window_->layer()->RequestCopyOfOutput(request.Pass());
@@ skipping 244 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