Revised assets for progress bars and indeterminate progress spinners.

Add support in ActionBar for activity-wide progress APIs.

Add ability for progress bars to set a target framerate rather than
the 5fps previously used.

Clean up some more dialog layouts using hardcoded styles rather than
theme attributes.

Change-Id: I8e88c7595e27c0b6f7829b598f2b084ac8501ae3