Bug 1096752 - Update the current time immediately when parsing a track fragment decode time in MPEG4Extractor. r=ajones

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extra : rebase_source : b35a36f5e140ba2aa0f8bb3e6acf611b019ad5db
Bug 1097375 - Implement MediaSource::setDuration. r=kinetik

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extra : rebase_source : 7e5f5387de5db3deccc6e74222b32f461359beb2
Bug 1097441 - Use SetScaleToSize for scaling videos so that it works for asynchronous size changes. r=roc

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extra : rebase_source : c18b17e8b146aa8a7cebc4125fd0dc86fb20f882