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This patch makes VideoTrackAdapter ignore aspect-ratio limits when
the input or output frame has zero area.
Also, output dimensions are clamped to media::limits::kMaxDimension.

Before this CL, an input source with zero area (e.g., from element capture)
could result in undefined behavior when trying to correct the frame's
aspect ratio due to casting of infinite or NaN floating-point values to int.

Bug: 763676
Change-Id: I23794e7aba965ee8443bde5c36ef2adfe8cc2ba3
Reviewed-on: https://chromium-review.googlesource.com/663177
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501506}