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Prior to this change there exists a window between when GpuMain()
hands off log collection and when GpuServiceImpl::InitializeWithHost()
starts forwarding to the GpuProcessHost. We have sometimes lost key
debugging logs in these cases.

Now GpuServiceImpl handles collection of GpuMain() logs all the way up
until GpuServiceImpl::InitializeWithHost() takes over, so no logs are
lost during startup.

Fixed: 1065082
Change-Id: I1d0376ca917218cb6cb6c7298ad59021ba6832ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2123329
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754614}