Revert "Use saveLayer-determined CT in SkGpuDevice::onCreateDevice"

This reverts commit 8c5c54ceafa9f32abf9e427dab5a551b0c8ad8b5.

Reason for revert: bad ANGLE diffs, Chrome roll failing

Original change's description:
> Use saveLayer-determined CT in SkGpuDevice::onCreateDevice
> 
> Currently Ganesh always uses the prev render target CT, but saveLayer
> may force a different CT, depending on flags.
> 
> This fixes handling of saveLayer/kF16ColorType (added in
> https://skia-review.googlesource.com/c/skia/+/227066).
> 
> Change-Id: I8e73fdfdf18eb61f97fadd0504a4bd0f4a71977d
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227258
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Florin Malita <fmalita@chromium.org>

TBR=bsalomon@google.com,fmalita@chromium.org

Change-Id: I0c3e74be64d5286b8d95b2aabaa464ad97fcaccf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227262
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
1 file changed