Bug 1046025 - Add component alpha support to TiledContentClient/Host. r=nical
Bug 1048110 - Expand complex visible regions if we're going to be resampling when using tiling. r=Bas
Bug 1048110 - Pad visible regions out by 1 pixel to avoid sampling from invalid content. r=Bas
Bug 1049303 - Avoid an invalid cast to ClientThebesLayer when we're using tiling. r=Bas