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This is a refactoring effort to have in-memory and in-file capture support for PaintPreviewBaseService.

Change-Id: I57c796d689239dfe133a0927979555b3e8b72ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548541Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Yashar Dabiran <yashard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831083}