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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/+/2560552Reviewed-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}