Align all copies of perf module: copyright notices, whitespace
Align all copies of perf module: imports
Add an overload of addMark that takes a canned real-time measurement
Add more timestamp constants
Sync more concise MeasurementLogger to the other apps
FpsGraphView: measure frame times in the same way as the XW version

If it takes from t+0 to t+17 to draw frame 1 and t+17 to t+27 to draw
frame 2, in the XW we record that as (abbreviating a little):

mark 0  0 frame
measure 0 17 to_next_frame
mark 17 0 frame
measure 17 10 to_next_frame
mark 27 0 frame

(the performance events interface automatically re-orders them.)

In this Java code we're not doing any clever re-ordering, but we
still want to measure the same thing in some order:

mark 0 0 frame
mark 17 0 frame
measure 0 17 to_next_frame
mark 27 0 frame
measure 17 10 to_next_frame
native Social: re-label

This is a write, not a read.
Generate marks as well as measures for the complete write/read cycle

This will make it easier to transcribe results.