GrContext option to prevent GPU based YUV -> RGB

Rob and I spent a long time debugging why this wasn't working for
Flutter - doing the more complex operations on the loading thread
produces a blank texture when it's used later on the drawing thread.

Limiting ourselves to just creating and uploading RGBA data fixes
that. We need to debug what's going wrong, but in the meantime, this
lets Flutter use Skia APIs to manage GPU uploading and lifetime of
texture-backed images, while still doing those uploads on their IO
thread.

BUG=skia:

Change-Id: Ibf5c37f2439814544beab8c93c2a646f7a9e779d
Reviewed-on: https://skia-review.googlesource.com/8443
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

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