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Originally GpuVideoAcceleratorFactoriesImpl get HW encoder
capabilities by referencing values stored GpuInfo instance.
However, the values are not updated after GPU process boots up.
Even if a new hw encoder is available after GPU process is
initialized, the hw encoder is not detected.

This fixes the problem by querying GPU process the hw encoder
capabilities when a render process is created. e.g. open the
page.

Bug: b:147404923
Test: HW encoder is used at appr.tc
Test: tast run webrtc.* on krane
Change-Id: Ibca82b6e54e9b5d585037c8e63f4c663d085db0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994849Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735339}