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>
1 file changed