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Similar to the pattern established by
https://chromium-review.googlesource.com/c/chromium/src/+/1713304
this change adds support for loopers for DrawImageRectOp.

Care is taken to keep image_provider->GetRasterContent outside the loop
since the raster content should be reused across loops.

Bug: 1065694
Change-Id: Ia716a0566565fe357d6c6a272659225328a781ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159125Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Sushanth Rajasankar <Sushraja@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#762124}