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Previously, ScrollRectToVisible bubbles up through its dom parent. It works
fine when its layout container is its dom parent, but this is not the case for
absolute-positioned elements. Simply scrolling the dom parent of an
absolute-positioned element wouldn't put the desired rect into view. This patch
changes the behavior by bubbling up through its layout parent.

BUG=645841
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2336013002
Cr-Commit-Position: refs/heads/master@{#419197}