Use computeVerticalScrollRange() to find the bottom of the page as mContentHeight is not in the view system.
Use computeVerticalScrollRange() to find the bottom
of the page as mContentHeight is not in the view system.

Fix http://b/issue?id=2251909

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base