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GetAvailableSize() is now present on View and LayoutManager.

Followup CLs will implement and add support for all LayoutManagerBase
layouts including having AnimatingLayoutManager use this information to
correctly plan animations.

Bug: 995448
Change-Id: Iaf50c9816af1b830e348f5019f30309147cd2c29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958589
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723510}