Bug 880114 - Enhance render video-to-SkiaGL performance by GPU-based color space conversioni.  r=gw280
Bug 1084651 - Part 1: Thread SliceBudget through several functions to choose the budget type at the source. r=billm
Bug 1084651 - Part 2: Clean up SliceBudget and require explicitly choosing between TimeBudget and WorkBudget. r=wmccloskey r=mccr8
Bug 1084651 - Part 3: Tighten up the bounds of SliceBudget to work as a budget should. r=wmccloskey
Bug 1084651 - Part 4: Adjust some tests to preserve previous behavior. r=wmccloskey
Bug 1084651 - Part 4b: Adjust and clarify some tests using gcslice(0). r=wmccloskey
Bug 1084651 - Part 5: Simplify Cycle Collector logic now that SliceBudget makes more sense. r=mccr8