Add more trace events to "benchmark" category

cc/trees/thread_proxy.cc

 // Copyright 2011 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/trees/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 326 matching lines @@
 
 void ThreadProxy::SetMaxSwapsPendingOnImplThread(int max) {
   impl().scheduler->SetMaxSwapsPending(max);
 }
 
 void ThreadProxy::DidSwapBuffersOnImplThread() {
   impl().scheduler->DidSwapBuffers();
 }
 
 void ThreadProxy::DidSwapBuffersCompleteOnImplThread() {
-  TRACE_EVENT0("cc", "ThreadProxy::DidSwapBuffersCompleteOnImplThread");
+  TRACE_EVENT0("cc,benchmark",
+               "ThreadProxy::DidSwapBuffersCompleteOnImplThread");
   DCHECK(IsImplThread());
   impl().scheduler->DidSwapBuffersComplete();
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::DidCompleteSwapBuffers, main_thread_weak_ptr_));
 }
 
 void ThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   impl().layer_tree_host_impl->WillBeginImplFrame(args);
 }
@@ skipping 989 matching lines @@
 
   impl().timing_history.DidActivateSyncTree();
 }
 
 void ThreadProxy::DidPrepareTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidPrepareTiles();
 }
 
 }  // namespace cc