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: Iab476c4afa4c70e25c452b2c430cbded5adb25e9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241876
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed