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Code checks for the size when allocating a raster shape
(for CSS shape-outside) but ASAN defeats this check by
allocating more than the exact image size. Be robust to
this case and other out-of-memory situations by handling
failed allocations.

R=fs@opera.com
BUG=779366

Change-Id: I11b1f9baaac21d89044dbaa1d5ed6cd188ccc813
Reviewed-on: https://chromium-review.googlesource.com/749320Reviewed-by: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513251}