Specify fill-box transform-box for circle.animation-{end,keyframe-}point

The transform-origin is supposed to be relative to the fill-box (the
object's/circle's bounding box) and not the viewport (which is the
initial value.)

Bug: 783985, 595829
Change-Id: I80b5b64a3bbeaca1d305972733820d361a7c064e
Reviewed-on: https://chromium-review.googlesource.com/765887
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#516671}
1 file changed