Apply CommandQueue::WaitAsync() to not block GPU main thread #12
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This PR move the DML implementation into GPU main thread (change in content/gpu/gpu_child_thread_receiver_bindings.cc) and applys CommandQueue::WaitAsync from the CL to not block GPU main.
I also remove the Sync GraphDMLImp:Build() and Compute() methods, because the mojom interface shares the same services implementation for Sync and Async.
I also verified that there is no performance regression for these changes.
@fdwr
@fujunwei @huningxin