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In response processing v1, UI elements are immediately added to the
response and are processed in unison.

In response processing v2, UI elements are pended while they each are
processed individually. Only then are they added to the response as
being ready for rendering, being careful to maintain the correct
order of insertion.

Bug: b:2063264
Change-Id: Ia487b0f7b99850314a6c83493e9f72af1b8b7b83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065410Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#744115}