Auto-compare GrProcessors' texture accesses in isEqual().

R=joshualitt@google.com

Review URL: https://codereview.chromium.org/654313002
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index f131d72..9dce5c2 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -1202,10 +1202,8 @@
             }
         }
 
-        return fTextureAccess.getTexture() == s.fTextureAccess.getTexture()  &&
-            fTextureAccess.getParams().getTileModeX() ==
-                s.fTextureAccess.getParams().getTileModeX() &&
-            this->useAtlas() == s.useAtlas();
+        SkASSERT(this->useAtlas() == s.useAtlas());
+        return true;
     }
 
     return false;