Revert of Consolidate GPU buffer implementations

src/gpu/batches/GrNinePatch.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 "GrNinePatch.h"
 
 #include "GrBatchFlushState.h"
@@ skipping 78 matching lines @@
         if (!gp) {
             SkDebugf("Couldn't create GrGeometryProcessor\n");
             return;
         }
 
         target->initDraw(gp);
 
         size_t vertexStride = gp->getVertexStride();
         int instanceCount = fGeoData.count();
 
-        SkAutoTUnref<const GrBuffer> indexBuffer(
+        SkAutoTUnref<const GrIndexBuffer> indexBuffer(
                 target->resourceProvider()->refQuadIndexBuffer());
         InstancedHelper helper;
         void* vertices = helper.init(target, kTriangles_GrPrimitiveType, vertexStride,
                                      indexBuffer, kVertsPerRect,
                                      kIndicesPerRect, instanceCount * kRectsPerInstance);
         if (!vertices || !indexBuffer) {
             SkDebugf("Could not allocate vertices\n");
             return;
         }
 
@@ skipping 64 matching lines @@
 
     typedef GrVertexBatch INHERITED;
 };
 
 namespace GrNinePatch {
 GrDrawBatch* CreateNonAA(GrColor color, const SkMatrix& viewMatrix, int imageWidth, int imageHeight,
                          const SkIRect& center, const SkRect& dst) {
     return new GrNonAANinePatchBatch(color, viewMatrix, imageWidth, imageHeight, center, dst);
 }
 };