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This is in preparation for fixing the behavior of SMIL events wrt to
seeking. This also makes these tests pass in Gecko with a single
exception.

svg/animations/begin-event.svg,
svg/animations/end-event.svg,
svg/animations/repeat-event.svg,
svg/animations/onbegin.svg,
svg/animations/onend.svg and
svg/animations/onrepeat.svg

 Adjust the seeked-to time so that the beginEvent/endEvent/repeatEvent
 is dispatched. Convert from reftests to testharness.js.

svg/animations/repeatn-event-1a.svg,
svg/animations/repeatn-event-1b.svg,
svg/animations/repeatn-event-1c.svg,
svg/animations/repeatn-event-1d.svg and
svg/animations/repeatn-event-1e.svg

 'repeatEvent's are not dispatched while seeking, so seek to just before
 the relevant repeat and then wait for the event. Convert from reftests
 to testharness.js.

svg/animations/repeatn-event-2a.svg

 Switch to "stepping through" all the repeat points rather than to the
 end directly. Convert from reftest to testharness.js.

wpt/svg/animations/repeatn-remove-add-animation.html

 Need to make sure that 'repeatEvent's are actually dispatched, so this
 test cannot use smil_async_test() which steps while paused.

Bug: 1039886
Change-Id: I500f5005a29ed22a920dd3835f8070b52d4def7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017527Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#735419}