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This CL plumbs the viewport size to the fling controller. There will be
follow up CL which will utilize this value for configuring fling
animation curve. Fling curve uses the viewport size to determine the
upper bound on how much distance a fling can travel/scroll.

Bug: 647137
Change-Id: I25896d9c514661ecc16e4f98b28e3d7c1f3b9f2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884758
Commit-Queue: Sarthak Shah <sarsha@microsoft.com>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713571}