Make GrMemoryPool play nice with bucketing allocators.

src/gpu/instanced/InstancedRendering.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef gr_instanced_InstancedRendering_DEFINED
 #define gr_instanced_InstancedRendering_DEFINED
 
@@ skipping 155 matching lines @@
                                              const SkRect& localRect, bool antialias,
                                              const GrInstancedPipelineInfo&, bool* requireHWAA);
 
     bool selectAntialiasMode(const SkMatrix& viewMatrix, bool antialias,
                              const GrInstancedPipelineInfo&, bool* useHWAA, AntialiasMode*);
 
     virtual Batch* createBatch() = 0;
 
     const sk_sp<GrGpu>                   fGpu;
     State                                fState;
-    GrMemoryPool                         fDrawPool;
+    GrObjectMemoryPool<Batch::Draw>      fDrawPool;
     SkSTArray<1024, ParamsTexel, true>   fParams;
     BatchList                            fTrackedBatches;
     sk_sp<const GrBuffer>                fVertexBuffer;
     sk_sp<const GrBuffer>                fIndexBuffer;
     sk_sp<GrBuffer>                      fParamsBuffer;
 };
 
 }
 
 #endif