GitLab

- Modifies partition allocator, adding a TryRealloc method that
  returns nullptr on failure, rather than OOM crashing.
- Modifies the single call site in Blink for buffer resizing during
  serialization.

Bug: chromium:857387
Change-Id: I9bf8d3ced837a9dd4f96a953bb52ccad3078dfa1
Reviewed-on: https://chromium-review.googlesource.com/1138859Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577561}