base

Adjust mBiggerTouchSlopSquare to the suitable value

If the scaling factor is larger than 1.0 (i.e. 1.5),
then mTouchSlopSquare(576) is bigger than mBiggerTouchSlopSquare(400).
The double tap condition should be bigger than a single tap's one.
This causes the fail of the following CTS test cases in the device has
over 240 density.
- android.view.cts.GestureDetectorTest
  * testOnTouchEvent
- android.view.cts.GestureDetector_SimpleOnGestureListenerTest
  * testSimpleOnGestureListener
To fix this issue, I'll add a new public method
ViewConfiguration#getScaledLargeTouchSlop() then the value returned
from that method is used as a slop area of mLargeTouchSlop.

Change-Id: I0e61c13670e1300be1ccf45a89ef89410496fb48