Bug 774388 - Patch 4: Flatten the way that we track whether we are using OMTC, and move Layers IPC shutdown code back to gfxPlatform (but still triggered by ShutdownXPCOM) - r=nical,sotaro
Bug 774388 - Patch 5: Wrap the global raw compositor thread pointer, and global raw refcount integer, into a proper refcounted singleton class - r=nical,mattwoodrow
Bug 774388 - Patch 6: fix a silly double negation - r=nical