Rework FlushSync to return early if commands have been processed since the last update

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index 8da55b69fcb3d8f13d541de759daf22b508e9390..105405544915463c10eada1cc7c9527065d7a913 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -49,7 +49,7 @@ CommandBufferHelper::~CommandBufferHelper() {
 
 bool CommandBufferHelper::FlushSync() {
   last_put_sent_ = put_;
-  CommandBuffer::State state = command_buffer_->FlushSync(put_);
+  CommandBuffer::State state = command_buffer_->FlushSync(put_, get_);
   SynchronizeState(state);
   return state.error == error::kNoError;
 }