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Currently RasterDecoder::CopySubTexture has three internal functions
for performing the copy based on the current backend. Previously
copying with Skia could require one extra copy when OneCopyRasterBuffer
was in use but this has been fixed with crrev.com/c/2517149. This CL
changes the copy to always default to Skia when OOPR Canvas is enabled.
A future CL will remove that restriction and always perform the copy
using Skia.

Bug: 984045
Change-Id: If317ceb59cf7eb93cfce521d2453a44348f6a2ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570079Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Nathan Zabriskie <nazabris@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#844213}