Compositor thread plumbing for layout rectangle debug info.

ui/compositor/layer.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 "ui/compositor/layer.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 649 matching lines @@
     return;
 
   force_render_surface_ = force;
   cc_layer_->SetForceRenderSurface(force_render_surface_);
 }
 
 std::string Layer::DebugName() {
   return name_;
 }
 
+scoped_refptr<base::debug::ConvertableToTraceFormat> Layer::TakeDebugInfo() {
+  return scoped_refptr<base::debug::ConvertableToTraceFormat>(NULL);

[danakj, 2013/12/03 00:38:18]

Maybe a TODO here to return some useful data so we can make use of this feature
for UI compositor, if that sounds right to you?

[chrishtr_gmail.com, 2013/12/03 00:44:08]

Done.

+}
+
 void Layer::OnAnimationStarted(const cc::AnimationEvent& event) {
   if (animator_.get())
     animator_->OnThreadedAnimationStarted(event);
 }
 
 void Layer::StackRelativeTo(Layer* child, Layer* other, bool above) {
   DCHECK_NE(child, other);
   DCHECK_EQ(this, child->parent());
   DCHECK_EQ(this, other->parent());
 
@@ skipping 277 matching lines @@
   cc_layer_->SetBounds(ConvertSizeToPixel(this, size));
 }
 
 void Layer::RecomputePosition() {
   cc_layer_->SetPosition(gfx::ScalePoint(
         gfx::PointF(bounds_.x(), bounds_.y()),
         device_scale_factor_));
 }
 
 }  // namespace ui