Have GPUTracer process traces during CommandBuffer Idle time.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 82e9052c63b7cc621771c35f4c0442676194ed3a..3132b4d6eca6344ad39879d3eca4e19f5ed1435d 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -11735,10 +11735,12 @@ void GLES2DecoderImpl::ProcessPendingReadPixels(bool did_finish) {
 
 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;