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Main thread animations provide no guarantees that the initial fling timestamp
will be strictly positive.  Consequently, a (valid) timestamp of 0 applied to
Android's fling animation curve will yield a zero-sized scroll delta.  Feeding
this scroll delta through WebViewImpl reports that scrolling is impossible, in
which case the fling will early terminate.  Avoid this case by early returning
on non-positive fling timestamps, aligning with Aura's fling behavior.

BUG=371854

Review URL: https://codereview.chromium.org/275113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269594 0039d316-1c4b-4281-b951-d872f2087c98