Avoid NPE in WebTextView.lineUpScroll -> Touch.getMaxScrollX
Avoid NPE in WebTextView.lineUpScroll -> Touch.getMaxScrollX

Bug: 3110967
Change-Id: I156070956528c8c7d1eb6db5d2e8bb1fe119178d

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