Bug 937688 - Some small cosmetic changes to existing code. r=botond
Bug 937688 - Add a helper to APZCCallbackHelper to obtain the presShellId and viewId. r=botond
Bug 937688 - Refactor some code to extract a TabChild::GetDocument method. r=botond
Bug 937688 - Pass the presShellId and viewId from TabChild to RenderFrameParent when updating zoom constraints. r=botond
Bug 937688 - Pass the presShellId and viewId from TabChild to RenderFrameParent when requesting a zoom. r=botond
Bug 937688 - Make APZCTM::UpdateCompositionBounds explicitly operate on the root APZC for a layer tree. r=botond
Bug 937688 - Move ScrollableLayerGuid from APZCTreeManager.h to FrameMetrics.h. r=botond
Bug 937688 - Get the guid from ReceiveInputEvent and use it in the callback to ContentReceivedTouch. r=botond