"Buttery Smooth" Tab Capture.

content/browser/renderer_host/render_widget_host_view_browsertest.cc

 // Copyright (c) 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 "base/command_line.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
@@ skipping 229 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(CompositingRenderWidgetHostViewBrowserTest);
 };
 
 class FakeFrameSubscriber : public RenderWidgetHostViewFrameSubscriber {
  public:
   FakeFrameSubscriber(
     RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback callback)
       : callback_(callback) {
   }
 
-  virtual bool ShouldCaptureFrame(base::TimeTicks present_time,
+  virtual bool ShouldCaptureFrame(const gfx::Rect& damage_rect,
+                                  base::TimeTicks present_time,
                                   scoped_refptr<media::VideoFrame>* storage,
                                   DeliverFrameCallback* callback) OVERRIDE {
     // Only allow one frame capture to be made.  Otherwise, the compositor could
     // start multiple captures, unbounded, and eventually its own limiter logic
     // will begin invoking |callback| with a |false| result.  This flakes out
     // the unit tests, since they receive a "failed" callback before the later
     // "success" callbacks.
     if (callback_.is_null())
       return false;
     *storage = media::VideoFrame::CreateBlackFrame(gfx::Size(100, 100));
@@ skipping 592 matching lines @@
                         CompositingRenderWidgetHostViewBrowserTestTabCapture,
                         testing::ValuesIn(kAllCompositingModes));
 INSTANTIATE_TEST_CASE_P(GLAndSoftwareCompositing,
                         CompositingRenderWidgetHostViewTabCaptureHighDPI,
                         testing::ValuesIn(kAllCompositingModes));
 
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 }  // namespace
 }  // namespace content