Fix a programmatic smooth scroll bug

Bug: smoothScrollToPosition() stops at child view of which height is
higher than list view itself.

Change-Id: I695ca9db4c706aa7f365967dd3916f9a01917346
Signed-off-by: Yongyi Li <yongyi.li.cn@gmail.com>
Improve AOSP Download/Upload animation

This increases the number of png required for a full download/upload animation cycle.
These new png makes the animations much smoother.
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