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

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 2e6a2c872e5279817cfd3bfbc45b59bb5b0550b8..f60588a32f4fabfec82dabd86c1784df37040908 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -481,9 +481,7 @@ GrDisplacementMapEffect::~GrDisplacementMapEffect() {
 
 bool GrDisplacementMapEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
     const GrDisplacementMapEffect& s = sBase.cast<GrDisplacementMapEffect>();
-    return fDisplacementAccess.getTexture() == s.fDisplacementAccess.getTexture() &&
-           fColorAccess.getTexture() == s.fColorAccess.getTexture() &&
-           fXChannelSelector == s.fXChannelSelector &&
+    return fXChannelSelector == s.fXChannelSelector &&
            fYChannelSelector == s.fYChannelSelector &&
            fScale == s.fScale;
 }