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Currently ImageSkiaReps are backed by SkBitmaps and cc::PaintImages.
While cc::PaintImages are drawables, they are sourced from the SkBitmaps
provided to the constructor. This means images that are sourced from
drawables, such as our vector icons, are rasterized into bitmaps first
and then stored as ImageSkiaReps. This rasterization takes place on the
UI thread.

This patch makes cc::PaintRecord as the backing store for ImageSkiaReps.
cc::PaintRecord are drawables and can be initialized with an SkBitmap if
needed. Having images stored this way means drawables like vector icons
dont need to be rasterized on the UI thread. Their rasterization will be
managed by cc or even the GPU in case of OOPR. This also removes the
constraint that ImageSkias are a rasterized source of image. It also
gives a way to add more drawable sources(CanvasImageSources) like
lottie.

This feature is hidden behind a feature flag UsePaintRecordForImageSkia.

Bug: 882507
Change-Id: Id4a6500ba0e12da382e95d59e5fa8bc5642082ab
Component: ImageSkiaRep, gfx, Image, Image Skia
Reviewed-on: https://chromium-review.googlesource.com/c/1227488Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596402}