KeyframeAnimation::fetchIntervalEndpointsForProperty could use binary search to lookup keyframes

At the moment KeyframeAnimation::fetchIntervalEndpointsForProperty uses linear search algorithm
to find keyframes that are closest to elapsed animation time. Keyframe lookup time could be
improved by using binary search.

BUG=233489
TEST=Covered by LayoutTests/animations

Review URL: https://chromiumcodereview.appspot.com/14189015

git-svn-id: svn://svn.chromium.org/blink/trunk@152650 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed