Fix crashes due to failed ImageBuffer allocation
Fix crashes due to failed ImageBuffer allocation

The fuzzers found a crash due to a failed ImageBuffer allocation in
SVGImage::drawPatternForContainer(...). This patch adds a check for
these failed allocations.

The added check in FilterEffect.cpp is just preventative and is not
required for this patch.

BUG=
R=schenney@chromium.org

Review URL: https://codereview.chromium.org/16555003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152268 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs