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With the display configuration now asynchronous, we can't immediately read the display size. We need to wait until the hardware is probed.

Also the VSyncProvider cannot trigger the given callback until the PlatformWindow is properly setup with the display. We need to wait for it the actually be resized.

BUG=447798
TEST=run video_decode_accelerator_unittest on freon

Review URL: https://codereview.chromium.org/835653005

Cr-Commit-Position: refs/heads/master@{#313473}