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On some platfroms, mouse events come with a bad timestamp, which leads to
awkward time-dependent gestures. For example, fling animation may be almost
instant.
Using base::TimeTicks::Now() is good enough for emulation purposes, because
emulator spawns new events itself.

BUG=367156

Review URL: https://codereview.chromium.org/250923005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266548 0039d316-1c4b-4281-b951-d872f2087c98