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When an ancestor clip changes, we set kSubtreeVisualRectUpdate to update
descendant visual rects which may be affected by the clip change.
Previously we early returned in PaintInvalidator::InvalidatePaint() for
descendants that had only kSubtreeVisualRectUpdate flag set. This caused
other visual rects (of e.g. scrollbars, carets) that are updated during
LayoutObject::InvalidatePaint() not updated.

Now move the early return from PaintInvalidator::InvalidatePaint() into
ObjectPaintInvalidator::ComputePaintInvalidationReason() to ensure the
visual rects are updated.

Bug: 727155
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I28f92281363c693b16121f48d21ab4f808990f14
Reviewed-on: https://chromium-review.googlesource.com/719716
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509648}