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

cc/output/gl_renderer.cc

 // Copyright 2010 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/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 2122 matching lines @@
 }
 
 void GLRenderer::Finish() {
   TRACE_EVENT0("cc", "GLRenderer::Finish");
   GLC(gl_, gl_->Finish());
 }
 
 void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
   DCHECK(!is_backbuffer_discarded_);
 
-  TRACE_EVENT0("cc", "GLRenderer::SwapBuffers");
+  TRACE_EVENT0("cc,benchmark", "GLRenderer::SwapBuffers");
   // We're done! Time to swapbuffers!
 
   gfx::Size surface_size = output_surface_->SurfaceSize();
 
   CompositorFrame compositor_frame;
   compositor_frame.metadata = metadata;
   compositor_frame.gl_frame_data = make_scoped_ptr(new GLFrameData);
   compositor_frame.gl_frame_data->size = surface_size;
   if (capabilities_.using_partial_swap) {
     // If supported, we can save significant bandwidth by only swapping the
@@ skipping 888 matching lines @@
   is_scissor_enabled_ = false;
   GLC(gl_, gl_->Disable(GL_SCISSOR_TEST));
   scissor_rect_needs_reset_ = true;
 }
 
 bool GLRenderer::IsContextLost() {
   return output_surface_->context_provider()->IsContextLost();
 }
 
 }  // namespace cc