Tap Latency test should show average latency

[dturner]

2 feature requests:

• Tap latency should show a numerical value for the average latency, without this you have to manually record the result of each tap and calculate the average latency yourself
• Also would be useful to show the sum of touch2kernel and kernel2java

[kamrik]

When you click the checkmark button on the tap screen (top left) it shows a summary with medians of the times. I think this is what you want, unless you prefer averages instead of the medians, which I would argue against :)
Agreed about the sum for touch to java.