GitLab

Switches ArrayBuffer and raw encoded message data mojom representations
to use BigBuffer instead of array<uint8>. This avoids large message data
exceeding hard size limitations.

Also introduces BigBufferView as a traits helper to avoid redundant
copies when a deserialized BigBuffer is using inline array storage.

Bug: 829659
Change-Id: I8b62d4bcd7458db1d6aff9e22dcb7c13999f0bf0
Reviewed-on: https://chromium-review.googlesource.com/1004594
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550021}