Suspend shared timers while blockingly closing databases

BUG=388771
R=michaeln@chromium.org

Review URL: https://codereview.chromium.org/409863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284785 0039d316-1c4b-4281-b951-d872f2087c98
GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
  if (!gpu_channel_.get())
    return NULL;

  if (gpu_channel_->IsLost())
    return NULL;

  return gpu_channel_.get();
}

GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
  if (!gpu_channel_.get())
    return NULL;

  if (gpu_channel_->IsLost())
    return NULL;

  return gpu_channel_.get();
}
