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This patch includes 2 changes, These changes only effect Windows
touchpad because only fling events on Windows touchpad can reach
overscroll controller.

1. Prevent fling event start overscroll.
2. Only fling events in first 0.3 second will processed for
   overscroll. On Windows, we don't generate the inertial
   events (fling) but receive them from Win API. In some cases,
   we get a long tail of inertial events for a couple of seconds.
   The overscroll animation feels like stuck in these cases. So
   we only process 0.3 second inertial events then cancel the
   overscroll if it is not completed yet.

Bug: 647140
Change-Id: Iea7941bff77a84f95acf8f342c12273cb909a5d3
Reviewed-on: https://chromium-review.googlesource.com/1025391
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556890}