Improve browser scrolling when using the mouse wheel.
Improve browser scrolling when using the mouse wheel.

The way that smooth scrolling is implemented in the Browser,
repeated requests to scroll by a certain amount do not add up
to one large scroll by the cumulative amount.  This makes
the mouse wheel unusable on large pages because the Browser
will scroll at a more or less constant rate no matter how often
the wheel is turned.

The fix is to not animate scrolls when using the mouse wheel.

Change-Id: I23c05cdd2383944b8730deb225b7f3f57f1729df

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