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Over the original patch that got reverted, this takes into account that
the android device can be in a different orientation. If the nexus
device happens to be in portrait mode in the lab, it will report a
480x640 resolution rather than 640x480, so this reland accounts for
that.

The main purpose of this test is to test the capture path on Android,
i.e. that we can acquire the device's built-in webcam. If we happen to
run on a device without a camera, we'll quietly succeed the test.

BUG=323921
R=tommi

Review URL: https://codereview.chromium.org/663793003

Cr-Commit-Position: refs/heads/master@{#300655}