Improve scrolling cache

Scrolling cache helps make short scrolls/flings smooth but will
cause stutter when long flings are made. This patch disables
scrolling cache when long flings are made.

This patch also fixes a related bug where scrolling cache will
not be enabled properly when transitioning from flinging to scrolling.

Patch Set 2: Calculate threshold based on maximum velocity (Sang Tae Park)

Change-Id: I1fdbaad92263c9f983a32900e74eba1f0367902b
Remove duplicate symbol
Fix array index oob in Matrix3f.loadRotate().

https://code.google.com/p/android/issues/detail?id=42860

Change-Id: Idbf18576da3ad5b84b4209147dad34cc2f9044d2
One more fix for incorrect indices.

Change-Id: I283f2f09cd0a17eefed4a763b08df856bbae76b3
Fix for truncated sentence in "Find on Page" field

When typing a text in find on page, then deleting it again the
default text in the field "Find on Page" is truncated by
an invisible view.

This commit fixes the problem by setting the visibility of
mMatches view changes to View.GONE instead of View.INVISIBLE.

Change-Id: I9889f22a254cdabb0cbaba72bff4b14158e5c9ff