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This is a reland of 07bb169a
This CL moves CollectGraphicsInfoGL and DidUpdateGPUInfo calls
onto the main thread, and creates a helper function
GpuServiceImpl::UpdateGpuInfoGL to do so.

Original change's description:
> Populate secondary GPU info after GPU switch on Mac.
>
> The secondary GPU was not populated with information taken from GL
> strings after a GPU switch. This CL addresses this by re-querying
> this information each time the GPU is switched.
> The active GPU in dual-GPU systems is now computed in the GPU
> process and communicated back to the browser process. The
> heuristic GpuDataManagerImpl::UpdateActiveGpu has been removed.
>
> Bug: chromium:1152212
> Change-Id: Ie54dd5dc06c3d0a1c5f0445cc0f313adc8fa24cf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560552
> Reviewed-by: Jonathan Backer <backer@chromium.org>
> Reviewed-by: Joe Mason <joenotcharles@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
> Cr-Commit-Position: refs/heads/master@{#832610}

Bug: chromium:1152212
Bug: chromium:1154752
Change-Id: I981fcabe87d651310ba27b42a0f1e926af67cb2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569953
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834743}