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1. In GpuProcessHost::OnProcessCrashed() record the process crash first.
   This means the GPU mode fallback will happen before a new GPU process
   is started.
2. Don't call FallBackToNextGpuMode() if GPU process initialization
   fails for an unsandboxed GPU process. The unsandboxed GPU is only
   used for collect information and it's failure doesn't indicate a need
   to change GPU modes.

Bug: 869419
Change-Id: I8bd0a03268f0ea8809f3df8458d4e6a92db9391f
Reviewed-on: https://chromium-review.googlesource.com/1157164Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579625}