Introduce GrBatch subclasses GrDrawBatch and GrVertexBatch to prepare for non-drawing batches

src/gpu/batches/GrDrawAtlasBatch.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 GrDrawAtlasBatch_DEFINED
 #define GrDrawAtlasBatch_DEFINED
 
 #include "GrBatch.h"
 #include "GrColor.h"
 #include "GrDefaultGeoProcFactory.h"
 
-class GrDrawAtlasBatch : public GrBatch {
+class GrDrawAtlasBatch : public GrVertexBatch {
 public:
     struct Geometry {
         GrColor                 fColor;
         SkTArray<uint8_t, true> fVerts;
     };
     
-    static GrBatch* Create(const Geometry& geometry, const SkMatrix& viewMatrix, int spriteCount,
-                           const SkRSXform* xforms, const SkRect* rects, const SkColor* colors) {
+    static GrDrawBatch* Create(const Geometry& geometry, const SkMatrix& viewMatrix,
+                               int spriteCount, const SkRSXform* xforms, const SkRect* rects,
+                               const SkColor* colors) {
         return SkNEW_ARGS(GrDrawAtlasBatch, (geometry, viewMatrix, spriteCount,
                                              xforms, rects, colors));
     }
     
     const char* name() const override { return "DrawAtlasBatch"; }
     
     void getInvariantOutputColor(GrInitInvariantOutput* out) const override {
         // When this is called on a batch, there is only one geometry bundle
         if (this->hasColors()) {
             out->setUnknownFourComponents();
@@ skipping 27 matching lines @@
     
     SkMatrix fViewMatrix;
     GrColor  fColor;
     int      fQuadCount;
     bool     fColorIgnored;
     bool     fCoverageIgnored;
     bool     fHasColors;
 };
 
 #endif