Assert the SVG paint invalidation container didn't change in invaliadateTreeAfterLayout
Assert the SVG paint invalidation container didn't change in invaliadateTreeAfterLayout

We don't support accelerated layers in SVG yet, so assert that the paint
invalidation container didn't change and avoid doing extra work to prove
that point in SVG's invalidateTreeAfterLayout method.

Review URL: https://codereview.chromium.org/361753004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@177254 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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