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When running GPU thread inside browser process, GpuPreferences is not
updated from GPU command line switches and blacklists. So we need update
those preferences in GpuDataManagerImplPrivate::UpdateGpuPreferences
when in_process_ is true.

Change-Id: Ic60e778e0c436b8f44365eec70c2855935629a54
Reviewed-on: https://chromium-review.googlesource.com/569324Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486963}