Bug 1083395 - Extract an InputQueue class from the APZC input code. r=
Bug 1083395 - Add target APZ confirmation before processing of an input block is allowed. r=
Bug 1083395 - Replace the touch block balance with an input block identifier. r=
Bug 1083395 - Move to a single input queue owned by the APZCTM instead of many queues owned by APZC instances. r=
Bug 1083395 - Move some APZC functions that are no longer needed in production down to the test subclass. r=