Bug 947781 - Part 1: Refactor RotatedBuffer to easily be re-usable for any rotated buffer drawing. r=mattwoodrow
Bug 947781 - Part 2: Add the ability to readback texture data to TextureClient. r=nical
Bug 947781 - Part 3: Do not transmit layer types that are unshadowed over the IPDL protocol. r=nical
Bug 947781 - Part 4: Add ReadbackLayer functionality to ClientLayerManager. r=mattwoodrow