Add relevant traces to measure copyFromCompositingSurface Turn-around time.

content/browser/renderer_host/render_widget_host_view_android.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.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 79 matching lines @@
   host->Send(new ViewMsg_ImeEventAck(host->GetRoutingID()));
 }
 
 void CopyFromCompositingSurfaceFinished(
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::SingleReleaseCallback> release_callback,
     scoped_ptr<SkBitmap> bitmap,
     const base::TimeTicks& start_time,
     scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock,
     bool result) {
+  TRACE_EVENT0(
+      "cc", "RenderWidgetHostViewAndroid::CopyFromCompositingSurfaceFinished");
   bitmap_pixels_lock.reset();
   release_callback->Run(0, false);
   UMA_HISTOGRAM_TIMES(kAsyncReadBackString,
                       base::TimeTicks::Now() - start_time);
   callback.Run(result, *bitmap);
 }
 
 ui::LatencyInfo CreateLatencyInfo(const blink::WebInputEvent& event) {
   ui::LatencyInfo latency_info;
   // The latency number should only be added if the timestamp is valid.
@@ skipping 614 matching lines @@
 void RenderWidgetHostViewAndroid::SetBackgroundOpaque(bool opaque) {
   RenderWidgetHostViewBase::SetBackgroundOpaque(opaque);
   host_->SetBackgroundOpaque(opaque);
 }
 
 void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     const SkColorType color_type) {
+  TRACE_EVENT0("cc", "RenderWidgetHostViewAndroid::CopyFromCompositingSurface");
   if ((!host_ || host_->is_hidden()) ||
       !IsReadbackConfigSupported(color_type)) {
     callback.Run(false, SkBitmap());
     return;
   }
   base::TimeTicks start_time = base::TimeTicks::Now();
   if (!using_synchronous_compositor_ && !IsSurfaceAvailableForCopy()) {
     callback.Run(false, SkBitmap());
     return;
   }
@@ skipping 792 matching lines @@
 
 // static
 void RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult(
     const gfx::Size& dst_size_in_pixel,
     const SkColorType color_type,
     const base::TimeTicks& start_time,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
   base::ScopedClosureRunner scoped_callback_runner(
       base::Bind(callback, false, SkBitmap()));
+  TRACE_EVENT0("cc",
+               "RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult");
 
   if (!result->HasTexture() || result->IsEmpty() || result->size().IsEmpty())
     return;
 
   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
   if (!bitmap->allocPixels(SkImageInfo::Make(dst_size_in_pixel.width(),
                                              dst_size_in_pixel.height(),
                                              color_type,
                                              kOpaque_SkAlphaType)))
     return;
@@ skipping 94 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content