Spruce up batch info printouts

src/gpu/batches/GrTInstanceBatch.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 GrTInstanceBatch_DEFINED
 #define GrTInstanceBatch_DEFINED
 
@@ skipping 34 matching lines @@
     DEFINE_BATCH_CLASS_ID
 
     typedef typename Impl::Geometry Geometry;
 
     static GrTInstanceBatch* Create() { return new GrTInstanceBatch; }
 
     const char* name() const override { return Impl::Name(); }
 
     SkString dumpInfo() const override {
         SkString str;
+        str.appendf("# batched: %d\n", fGeoData.count());
         for (int i = 0; i < fGeoData.count(); ++i) {
             str.append(Impl::DumpInfo(fGeoData[i], i));
         }
         str.append(INHERITED::dumpInfo());
         return str;
     }
 
     void computePipelineOptimizations(GrInitInvariantOutput* color,
                                       GrInitInvariantOutput* coverage,
                                       GrBatchToXPOverrides* overrides) const override {
@@ skipping 76 matching lines @@
         return true;
     }
 
     GrXPOverridesForBatch fOverrides;
     SkSTArray<1, Geometry, true> fGeoData;
 
     typedef GrVertexBatch INHERITED;
 };
 
 #endif