CC: Add 'cc-benchmark' traces for minimal tracing in benchmarks.

cc/output/delegating_renderer.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/output/delegating_renderer.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 104 matching lines @@
       base::Bind(&AppendToArray, &resources);
   for (size_t i = 0; i < out_data.render_pass_list.size(); ++i) {
     RenderPass* render_pass = out_data.render_pass_list.at(i);
     for (size_t j = 0; j < render_pass->quad_list.size(); ++j)
       render_pass->quad_list[j]->IterateResources(append_to_array);
   }
   resource_provider_->PrepareSendToParent(resources, &out_data.resource_list);
 }
 
 void DelegatingRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
-  TRACE_EVENT0("cc", "DelegatingRenderer::SwapBuffers");
+  TRACE_EVENT0("cc,cc-benchmark", "DelegatingRenderer::SwapBuffers");
   CompositorFrame compositor_frame;
   compositor_frame.metadata = metadata;
   compositor_frame.delegated_frame_data = delegated_frame_data_.Pass();
   output_surface_->SwapBuffers(&compositor_frame);
 }
 
 void DelegatingRenderer::GetFramebufferPixels(void* pixels,
                                               const gfx::Rect& rect) {
   NOTREACHED();
 }
@@ skipping 41 matching lines @@
   gpu::ManagedMemoryStats stats;
   stats.bytes_required = bytes_visible;
   stats.bytes_nice_to_have = bytes_visible_and_nearby;
   stats.bytes_allocated = bytes_allocated;
   stats.backbuffer_requested = false;
 
   context_provider->ContextSupport()->SendManagedMemoryStats(stats);
 }
 
 }  // namespace cc