Revert "Reduce dependence on GrSurface's origin field"

This reverts commit 467022b1861033d968195687da15270c208279ff.

Reason for revert: GrAHardwareBufferImageGenerator.cpp

Original change's description:
> Reduce dependence on GrSurface's origin field
> 
> Unfortunately, GrGPU and its ilk are still using the GrSurface's origin a lot. I will clean that up in a second CL.
> 
> Change-Id: Iba729440ce8ea8d24bb7f4e5de55ed576a0f176d
> Reviewed-on: https://skia-review.googlesource.com/24700
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,robertphillips@google.com

Change-Id: I1b3f5c3b82d250ac164beb1d5c83abb6c3c6ab3b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/25620
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 06e7e68..90756a7 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -597,15 +597,14 @@
 void GrGLDisplacementMapEffect::onSetData(const GrGLSLProgramDataManager& pdman,
                                           const GrFragmentProcessor& proc) {
     const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>();
-    GrSurfaceProxy* proxy = displacementMap.textureSampler(1).proxy();
-    GrTexture* colorTex = proxy->priv().peekTexture();
+    GrTexture* colorTex = displacementMap.textureSampler(1).peekTexture();
 
     SkScalar scaleX = displacementMap.scale().fX / colorTex->width();
     SkScalar scaleY = displacementMap.scale().fY / colorTex->height();
     pdman.set2f(fScaleUni, SkScalarToFloat(scaleX),
-                proxy->origin() == kTopLeft_GrSurfaceOrigin ?
+                colorTex->origin() == kTopLeft_GrSurfaceOrigin ?
                 SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY));
-    fGLDomain.setData(pdman, displacementMap.domain(), proxy);
+    fGLDomain.setData(pdman, displacementMap.domain(), colorTex);
     if (SkToBool(displacementMap.colorSpaceXform())) {
         fColorSpaceHelper.setData(pdman, displacementMap.colorSpaceXform());
     }