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This CL implements the rasterization part for a paint image that is
generated by PaintWorklet, which is the DrawImageOp::RasterWithFlags.

Bug: 907897
Change-Id: I993d29035f1ad09e7cbe3caecc5445876078ac01
Reviewed-on: https://chromium-review.googlesource.com/c/1426015Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633815}