Bug 870021 - Part 1.1 - Teach parser about srcset (needs generation). r=hsivonen
Bug 870021 - Part 1.2 - Teach parser about srcset (generated bits). r=hsivonen
Bug 870021 - Part 1.3 - Add srcset to HTMLImageElement & atoms. r=jst, sr=jst
Bug 870021 - Part 2 - Add ResponsiveImageSelector class with basic srcset support. r=jst
Bug 870021 - Part 3 - Support basic srcset in HTMLImageElement via ResponsiveSelector. r=jst
Bug 870021 - Part 4 - Move HTMLImageElement::GetNatural{Height,Width} up to ImageLoadingContent. r=jst
Bug 870021 - Part 5.1 - HTMLImageElement responsive-aware overrides for GetNatural{Width,Height}. r=jst
Bug 870021 - Part 5.2 - Ask content to compute its intrinsic size in nsImageFrame. r=roc
Bug 870021 - Part 5.3 - nsImageFrame should take orientation into account when getting natural size from content. r=roc
Bug 870021 - Part 6 - Add getCurrentSrc to HTMLImageElement. r=jst, sr=jst