Smaller fragment from "Reduce dependence on GrSurface's origin field"

TBR=bsalomon@google.com
Change-Id: I996226ffaf84ca357740a6da9bb80a3b8febb379
Reviewed-on: https://skia-review.googlesource.com/25745
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp b/src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp
index 4d1a99d..1ab9b78 100644
--- a/src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp
+++ b/src/gpu/effects/GrGaussianConvolutionFragmentProcessor.cpp
@@ -121,10 +121,11 @@
                                       const GrFragmentProcessor& processor) {
     const GrGaussianConvolutionFragmentProcessor& conv =
             processor.cast<GrGaussianConvolutionFragmentProcessor>();
-    GrTexture& texture = *conv.textureSampler(0).peekTexture();
+    GrSurfaceProxy* proxy = conv.textureSampler(0).proxy();
+    GrTexture& texture = *proxy->priv().peekTexture();
 
     float imageIncrement[2] = {0};
-    float ySign = texture.origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
+    float ySign = proxy->origin() != kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
     switch (conv.direction()) {
         case Gr1DKernelEffect::kX_Direction:
             imageIncrement[0] = 1.0f / texture.width();
@@ -149,7 +150,7 @@
             pdman.set2f(fBoundsUni, inv * bounds[0], inv * bounds[1]);
         } else {
             SkScalar inv = SkScalarInvert(SkIntToScalar(texture.height()));
-            if (texture.origin() != kTopLeft_GrSurfaceOrigin) {
+            if (proxy->origin() != kTopLeft_GrSurfaceOrigin) {
                 pdman.set2f(fBoundsUni, 1.0f - (inv * bounds[1]), 1.0f - (inv * bounds[0]));
             } else {
                 pdman.set2f(fBoundsUni, inv * bounds[1], inv * bounds[0]);