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cc::UpdateTickingType::FORCE is only used in two circumstances:

1. From ElementAnimations::InitAffectedElementTypes.
2. From ElementAnimations::ElementRegistered.

Since InitAffectedElementTypes is only called when constructing a new
ElementAnimations, the call can be moved to the constructor such that we
can guarantee the keyframe_effects_list_ is empty and thus remove the
call to UpdateKeyframeEffectsTickingState(FORCE).

When called from ElementRegistered, we are about to set
has_element_in_active_list or has_element_in_pending_list which will
result in the keyframe effect having an element in a list giving the
same behavior that force was being used to provide. The other possible
side effects of force seem unintentional.

Change-Id: I6128793e953ad2e59fbc7657033995292c204f48
Reviewed-on: https://chromium-review.googlesource.com/c/1469070
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632337}