Patrick Scott 6231091feb Add fling to scrollable layers.
Requires a change in external/webkit.

Use the normal drag/fling pipeline but handle layers in each of the callbacks.
Record the scrolling range for a layer and use it to compute the fling/drag
ranges.  If the user reaches the edge of a layer, switch to scrolling the main
page unless the user switches direction.

Change-Id: Ifedde8fcf4f76d533586164c75defcebffec16e9
2010-12-07 13:12:44 -05:00
..
2010-12-07 13:12:44 -05:00