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We aren't benefitting from the complexity added by the
DeferredTextureImageData APIs, and this API blocks us from using
PaintImage::Decode's decode-to-scale functionality.

This change removes our usage of DeferredTextureImageData APIs,
instead using SkImage::makeTextureImage to handle upload. Additionally,
we now use the PaintImage::Decode API, adding decode-to-scale support.

Bug: 773799
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ia5f480213c3a5c8225ccd289aa2c081056840f94
Reviewed-on: https://chromium-review.googlesource.com/713593Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517206}