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RendererProxy is used mainly on the UI thread, but it is deleted on the
display thread because GlDisplayRenderer binds its WeakPtrFactory to
the display thread when initializing it. This forces QueuedTaskPoster
to be deleted on the wrong thread, which may be a source of crash. You
can see more details in the bug.

This CL resolves this by making GlDisplayRenderer::Core initialize
RendererProxy on the UI thread.

Bug: 872944
Change-Id: I37dbd20aad80dd05e4eb0ad410c339fdfa5053c5
Reviewed-on: https://chromium-review.googlesource.com/1170133
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582674}