Remove the clickUiObject method from the base class and refactor the
gmail workload to use clickAndWaitForWindow methods instead. For quick
popup menus prefer simple click events.
A new workload for testing context switching between applications.
Uses googlephotos as the producer workload and gmail and skype as
the consumer workloads.
This allows workloads to be launched in a pre-determined orientation not the orientation of the physical device itself.
Updated the productivity workloads to take advantage of this new facility.
