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The autoclick scroll bubble animation was jumpy because the arrow
and anchor rect changes both kicked off animations. This gives
subclasses of BubbleDialogDelegateView the option to set the arrow
without creating an animation, in order to fix the visual bug.

Bug: 978163
Change-Id: Id4feb50e35a3945c24e5759d953261a02dd4970c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1691549
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676211}