GitLab

This CL implements logic from GLES2CommandBufferStub::Initialize() in
InProcessCommandBuffer::InitializeOnGpuThread(). Some differences are
not addressed and I've left TODOs instead.

Bug: 832243, 811979
Change-Id: I1139a33f594280ea4c17b3a7223391e33bc15ad6
Reviewed-on: https://chromium-review.googlesource.com/1006038Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550630}