Add layer name into frame viewer

cc/layers/heads_up_display_layer.cc

 // Copyright 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 "cc/layers/heads_up_display_layer.h"
 
 #include <algorithm>
+#include <string>
 
 #include "base/debug/trace_event.h"
 #include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/trees/layer_tree_host.h"
 
 namespace cc {
 
 scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::Create() {
   return make_scoped_refptr(new HeadsUpDisplayLayer());
 }
 
 HeadsUpDisplayLayer::HeadsUpDisplayLayer() {}
 
 HeadsUpDisplayLayer::~HeadsUpDisplayLayer() {}
 
 void HeadsUpDisplayLayer::PrepareForCalculateDrawProperties(
     gfx::Size device_viewport, float device_scale_factor) {
   gfx::Size device_viewport_in_layout_pixels = gfx::Size(
       device_viewport.width() / device_scale_factor,
       device_viewport.height() / device_scale_factor);
 
   gfx::Size bounds;
   gfx::Transform matrix;
   matrix.MakeIdentity();
 
+  bool is_tracing;
+  TRACE_EVENT_CATEGORY_GROUP_ENABLED("cc", &is_tracing);
+  if (is_tracing)
+      SetDebugName("Heads Up Display Layer");
+  else
+      SetDebugName(std::string());
+
   if (layer_tree_host()->debug_state().ShowHudRects()) {
     int max_texture_size =
         layer_tree_host()->GetRendererCapabilities().max_texture_size;
     bounds.SetSize(std::min(max_texture_size,
                             device_viewport_in_layout_pixels.width()),
                    std::min(max_texture_size,
                             device_viewport_in_layout_pixels.height()));
   } else {
     int size = 256;
     bounds.SetSize(size, size);
     matrix.Translate(device_viewport_in_layout_pixels.width() - size, 0.0);
   }
 
   SetBounds(bounds);
   SetTransform(matrix);
 }
 
 bool HeadsUpDisplayLayer::DrawsContent() const { return true; }
 
 scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_).
       PassAs<LayerImpl>();
 }
 
 }  // namespace cc