All batches do their own pipeline compare

src/gpu/GrPipeline.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrPipeline.h"
 
 #include "GrCaps.h"
@@ skipping 135 matching lines @@
     } else {
         if (coveragePOI.readsFragPosition()) {
             fReadsFragPosition = true;
         }
     }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 bool GrPipeline::isEqual(const GrPipeline& that) const {
+    // If we point to the same pipeline, then we are necessarily equal
+    if (this == &that) {
+        return true;
+    }
+
     if (this->getRenderTarget() != that.getRenderTarget() ||
         this->fFragmentStages.count() != that.fFragmentStages.count() ||
         this->fNumColorStages != that.fNumColorStages ||
         this->fScissorState != that.fScissorState ||
         this->fFlags != that.fFlags ||
         this->fStencilSettings != that.fStencilSettings ||
         this->fDrawFace != that.fDrawFace) {
         return false;
     }
 
     if (!this->getXferProcessor()->isEqual(*that.getXferProcessor())) {
         return false;
     }
 
     // The program desc comparison should have already assured that the stage counts match.
     SkASSERT(this->numFragmentStages() == that.numFragmentStages());
     for (int i = 0; i < this->numFragmentStages(); i++) {
 
         if (this->getFragmentStage(i) != that.getFragmentStage(i)) {
             return false;
         }
     }
     return true;
 }