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This CL modifies AnimatedContainerView to:
- Split HandleResponse() into HandleSuggestion() and HandleUiElement().
- In this CL, these new functions are invoked at the same time as
  HandleResponse(), but a follow up CL will add additional invocations
  in response processing v2 in reaction to AssistantResponseObserver
  events.
- Modifies existing paradigm of derivative classes explicitly having to
  call AddElementAnimator() to instead have HandleSuggestion() and
  HandleUiElement() return any new animators that should be owned and
  acted upon. This will be convenient in response processing v2 when
  animations are most often *not* performed in unison.

Other changes in this CL are trivial and should be straightforward to
follow :)

Note that this CL has *no effect* on existing behavior.


Bug: b:129411551
Change-Id: Ibbcd7654c5a2b6dfe7ca488dc559738531085b09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067473
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Jeroen Dhollander <jeroendh@google.com>
Cr-Commit-Position: refs/heads/master@{#745742}