Have GPUTracer process traces during CommandBuffer Idle time.

gpu/command_buffer/service/gles2_cmd_decoder.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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 11717 matching lines @@
         pending_readpixel_fences_.front()->callbacks;
     pending_readpixel_fences_.pop();
     for (size_t i = 0; i < callbacks.size(); i++) {
       callbacks[i].Run();
     }
   }
 }
 
 bool GLES2DecoderImpl::HasMoreIdleWork() {
   return !pending_readpixel_fences_.empty() ||
-      async_pixel_transfer_manager_->NeedsProcessMorePendingTransfers();
+      async_pixel_transfer_manager_->NeedsProcessMorePendingTransfers() ||
+      gpu_tracer_->HasTracesToProcess();
 }
 
 void GLES2DecoderImpl::PerformIdleWork() {
+  gpu_tracer_->ProcessTraces();
   ProcessPendingReadPixels(false);
   if (!async_pixel_transfer_manager_->NeedsProcessMorePendingTransfers())
     return;
   async_pixel_transfer_manager_->ProcessMorePendingTransfers();
   ProcessFinishedAsyncTransfers();
 }
 
 error::Error GLES2DecoderImpl::HandleBeginQueryEXT(uint32 immediate_data_size,
                                                    const void* cmd_data) {
   const gles2::cmds::BeginQueryEXT& c =
@@ skipping 3031 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu