Added a test WebM file containing resolution changes. This file has been added
to gPlayTests to test playback of such files. A new test has been added,
test_resolution_change.html, which reads a new test array,
gResolutionChangeTests, of media files containing resolution changes. This new
test check that after playing a file through at least one resolution change has
taken place.
MozReview-Commit-ID: 8yz1ccz8g6O
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extra : rebase_source : 3fddc9116e9a5d20afcf58d795d288875084a08e
Florian Quèze
Bryce Van Dyk