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Implemented common mechanism for targeting animation events initiated by animations and
worklet animations. Changes made:

- AnimationHost::SetAnimationEvents consults animation timeline to find a target animation.
- Moved animation events routing logic from cc:ElementAnimations to cc:Animation.
- Directly route to the target keyframe model using keyframe id and model id instead of using
  element id and group id to identify the target keyframe model.

Bug: 1013727
Change-Id: I28613b0e708258e6433a45e828710caa3e73e280
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872486
Commit-Queue: Olga Gerchikov <gerchiko@microsoft.com>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719388}