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Currently GpuServiceImpl::CreateGpuMemoryBuffer blocks the IO thread
until the DRM thread allocates the buffer. However, the DRM thread
cannot allocate the buffer until the corresponding AcceleratedWidget is
registered, which depends on the IO thread staying responsive in order
to receive the registration message from the browser and process it.
This causes a deadlock. In order to avoid this, make
GpuServiceImpl::CreateGpuMemoryBuffer asynchronous.

Bug: 981721,620927
Change-Id: Id35f17cc4ff3a800999e84cb76ca3e134bc13a8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696353
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676629}