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RemoteFrameView::GetCompositingRect uses geometry mapping code that
relies on a clean layout state; but it is called from
RenderFrameProxy::SynchronizeVisualProperties, which is called from
many places, including in response to IPCs.

With this change, the compositing rect is calculated and cached
during each lifecycle update, and GetCompositingRect returns the
cached value.

BUG=1033746

Change-Id: I29c50c954829ef856d667b1948e1ea840904004a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028863
Commit-Queue: Stefan Zager <szager@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743459}