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For RSDM (wip patch crrev.com/c/2295379), the ImageDecodeCache expects
DarkModeFilter work on SkPixmap. This patch makes
DarkModeImageClassifier use SkPixmap instead of PaintImage. Also as
RSDM requires the purging of the cache to be implemented in decoded
image cache, this patch moves dark mode image cache outside dark mode
module. Now blink implements caching in Image class and dark mode
filter helper is added to handle cache modifications.

To check the correctness of the dark mode classifier logic to work on
full image than portion of the image, few more tests related to image
sprite and block samples are added.

Bug: 1094005
Change-Id: I39dbd7638691da459b898045d4721069dc5dd21c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382990Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#809969}