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Issue was with Linux MSAN un-initialized memory usage of
is_painting_preview_

Fix: Set a default value of is_painting_preview_ = false.

This is a reland of 2c483e93

Original change's description:
> [Paint Preview] Inject PaintPreviewTracker
>
> Adds the ability to inject paint_preview::PaintPreviewTracker into
> blink::GraphicsContext to act similarly to printing::MetafileSkia.
> This class will track various metadata about the Paint Preview
> capture process.
>
> Design Doc: go/fdt-design (internal)
> Part of Landing: crrev/1786583
>
> Bug: 1008885
> Change-Id: Iba2819491bee7b284de62a1bf888aa9486c788cf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829277
> Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
> Reviewed-by: Ian Vollick <vollick@chromium.org>
> Auto-Submit: Calder Kitagawa <ckitagawa@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#703720}

Bug: 1008885
Change-Id: I6eb1c6ee25954bbbc381851a8bf54b759098ac09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847941Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704154}