Bug 947337 - Small refactoring to reduce an unnecessary codepath. r=botond a=1.3+
Bug 947337 - Track the last metrics actually sent to Gecko after coming out of the throttler. r=botond a=1.3+
Bug 947337 - Ensure the transform of input to Gecko space accounts for inflight paint requests. r=botond a=1.3+
Bug 947337 - Update APZC tests to exercise the newly introduced transform. r=botond a=1.3+