Move NullColorbuffer handling from Framebuffer to Renderer9 Trac #22229 Uses a 12-entry LRU cache to avoid recreating them unnecessarily. Signed-off-by: Nicolas Capens Signed-off-by: Shannon Woods git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1567 736b8ea6-26fd-11df-bfd4-992fa37f6226