Put clear and discard into GrBatch.

src/gpu/batches/GrDrawBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawBatch_DEFINED
 #define GrDrawBatch_DEFINED
 
@@ skipping 38 matching lines @@
     const GrPipeline* pipeline() const {
         SkASSERT(fPipelineInstalled);
         return reinterpret_cast<const GrPipeline*>(fPipelineStorage.get());
     }
 
     bool installPipeline(const GrPipeline::CreateArgs&);
 
     // TODO no GrPrimitiveProcessors yet read fragment position
     bool willReadFragmentPosition() const { return false; }
 
+    uint32_t renderTargetUniqueID() const final {
+        SkASSERT(fPipelineInstalled);
+        return this->pipeline()->getRenderTarget()->getUniqueID();
+    }
+
+    SkString dumpInfo() const override {
+        SkString string;
+        string.append("ColorStages:\n");
+        for (int i = 0; i < this->pipeline()->numColorFragmentStages(); i++) {
+            string.appendf("\t\t%s\n", this->pipeline()->getColorStage(i).processor()->name());
+        }
+        string.append("CoverageStages:\n");
+        for (int i = 0; i < this->pipeline()->numCoverageFragmentStages(); i++) {
+            string.appendf("\t%s\n", this->pipeline()->getCoverageStage(i).processor()->name());
+        }
+        string.appendf("XP: %s\n", this->pipeline()->getXferProcessor()->name());
+        return string;
+    }
+
 private:
     /**
      * initBatchTracker is a hook for the some additional overrides / optimization possibilities
      * from the GrXferProcessor.
      */
     virtual void initBatchTracker(const GrPipelineOptimizations&) = 0;
 
 protected:
     SkTArray<SkAutoTUnref<GrBatchUploader>, true>   fInlineUploads;
 
 private:
     SkAlignedSTStorage<1, GrPipeline>               fPipelineStorage;
     bool                                            fPipelineInstalled;
     typedef GrBatch INHERITED;
 };
 
 #endif