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This is a reland of 325dbbc8

Original change's description:
> [Feed v2] Allow setting feed stream data in feed internals page
>
> Bug: none
> Change-Id: Iecc0cb44e239c1b4502e81bc50931230732af61a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429930
> Commit-Queue: Jian Li <jianli@chromium.org>
> Reviewed-by: Justin DeWitt <dewittj@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Dan H <harringtond@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#814073}

Bug: none
Change-Id: I580f6bcf05f9876db07a966d4ed9af51f924296b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451921Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814735}