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These DCHECKs are firing in telemetry tests on the GPU bots.  Removes the
DCHECKs and instead adds debug logging to help track down the root cause.

Since the window size invariants are not holding in some situations, this CL
also contains code to fixup the window size if it is wrong.

BUG=464754
TEST=None

Review URL: https://codereview.chromium.org/1018693003

Cr-Commit-Position: refs/heads/master@{#321000}