Revert "GPU: always use TopLeft origin for saveLayer render targets."

This reverts commit 6f24faa623.

Reason for revert: larger impact on GMs than expected

Original change's description:
> GPU: always use TopLeft origin for saveLayer render targets.
> 
> Should have no user-visible result.
> 
> Change-Id: Iae444888557347bfdf75e6353966cde907ee0a1e
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/222506
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Stephen White <senorblanco@chromium.org>

TBR=egdaniel@google.com,bsalomon@google.com,senorblanco@chromium.org

Change-Id: Ic8217206adfbd7d506a70c3d9ca828f0dde58c66
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/222509
Reviewed-by: Stephen White <senorblanco@chromium.org>
Commit-Queue: Stephen White <senorblanco@chromium.org>

src/gpu/SkGpuDevice.cpp

@@ -1695,7 +1695,7 @@ SkBaseDevice* SkGpuDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint
             format, fit, cinfo.fInfo.width(), cinfo.fInfo.height(), config,
             fRenderTargetContext->colorSpaceInfo().refColorSpace(),
             fRenderTargetContext->numStencilSamples(), GrMipMapped::kNo,
-            kTopLeft_GrSurfaceOrigin, &props));
+            kBottomLeft_GrSurfaceOrigin, &props));
     if (!rtc) {
         return nullptr;
     }