Bug 1047743 - Screen sharing with multiple screens is broken (Mac only). r=jesup
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Bug 1047743 - interdiff to not impact other platforms
Bug 1055378 - Adds RTCRTPStreamStats.mediaType + test of getStats w/track arg. r=smaug,drno,jesup
Bug 1055378 - getStats w/non-null track arg now returns stats for the right track. r=jesup
Bug 1055378 - Tightened test of getStats w/track arg. r=drno