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A DCHECK is triggered in GpuWatchdogThreadImplV2::Arm() during GPU
initialization. Whenever there is an error, GpuInit::InitializeAndStartSandbox()
exits earlier. watchdog_thread_->OnInitComplete() is not called in those cases
and arm_disarm_counter_ gets messed up.
A new class GpuWatchdogInit is created to call OnInitcomplete() in the destructor.
OnInitComplete() will never be missed at the end of InitializeAndStartSandbox().

Bug:949839, 995372

Change-Id: I1a107df0ca48409ff2252260ea41de643fa39b6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762879Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689343}