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In response processing v2, the pending response will be committed at
the earliest opportunity so that it can begin rendering.

This CL should *not* affect response processing v1.

Follow up CLs will make additional changes to processing logic and
rendering logic to accommodate this new streaming model.

Bug: b:129411551
Change-Id: I86c22929eb24945f104a06fbbe5ae0b1468caa5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063264
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743211}