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in_gpu_initialization_ was set by the GPU main thread and read by the
watchdog thread. This caused data race. This CL fixes it by setting
the flag in the watchdog thread only after the init in the constructor.

Bug:1029475, 1028946

Change-Id: I5c38a2af70962e0d68880e930b6657f7107d2def
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943545Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720748}