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Now that we're allowed to use absl::variant, reimplement Image to use an
absl::variant<pp::ImageData, SkBitmap> internally. Behavior should
remain largely the same, with slightly less memory overhead.

Bug: 1099020
Change-Id: Ia4b2398ceae6156997be8904562778d47af97e32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333538Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794775}