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This patch adds enable-raster-side-dark-mode-for-images switch to
enable raster side dark mode for images and initial functionality
to enable RSDM for bitmap images. PaintFlags will carry the
|use_dark_mode_for_image_| bit for specifying whether the
compositor should use a dark mode filter when rasterizing images.

Bug: 1094005
Change-Id: I424c9397235733fb07df4f1cad7bb758399fded9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445890Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#814106}