Bug 828146. Ensure nsDisplayBackgroundImage::ComputeInvalidationRegion invalidates something for nsDisplayBackgroundImages which are themed. r=mattwoodrow

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extra : rebase_source : 1050ffe991aed624958b9cb63f142a76a34fc67d
Bug 830707. Part 1: Add code for upmixing and downmixing following Web Audio's spec. r=jesup

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extra : rebase_source : 8cdcbc313fcd371b47ad194f2f0da1102e5e6240
Bug 830707. Part 1.5: Add MAX_AUDIO_SAMPLE_SIZE and tweak AddAudioSampleOffset. r=jesup

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extra : rebase_source : 75fed94d7020d375c5044f707cbfd6c29faf90af
Bug 830707. Part 2: Mix channels to output channel count when playing audio. r=jesup

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extra : rebase_source : a13d8ec691689e3aa57cd42c9d437f91197d4253
Bug 830707. Part 3: Don't constrain AudioSegment to a fixed number of channels. r=jesup

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extra : rebase_source : feacede00821b6673ce04c886a9c3727a4989404