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This is a reland of 2bc512d7

Original change's description:
> Support downsampling in ViewResourceAdapter
>
> Bug: 965609
> Change-Id: I148d5fe8b7371a529b612ed2e9b407ced0062f82
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623139
> Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
> Reviewed-by: David Trainor <dtrainor@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#662915}

Bug: 965609, 966859
TBR=dtrainor@chromium.org

Change-Id: I3da718de48413f22060f7504c78932d941929308
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635431Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664615}