Add resource provider flag to avoid client-side buffers

src/gpu/instanced/GLInstancedRendering.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_GLInstancedRendering_DEFINED
 #define gr_instanced_GLInstancedRendering_DEFINED
 
@@ skipping 26 matching lines @@
     void flushInstanceAttribs(int baseInstance);
 
     struct GLDrawCmdInfo {
         int fInstanceCount;
 #if GR_GL_LOG_INSTANCED_BATCHES
         IndexRange fGeometry;
 #endif
     };
 
     GrGLuint                              fVertexArrayID;
-    SkAutoTUnref<GrGLBuffer>              fInstanceBuffer;
-    SkAutoTUnref<GrGLBuffer>              fDrawIndirectBuffer;
+    SkAutoTUnref<GrBuffer>                fInstanceBuffer;
+    SkAutoTUnref<GrBuffer>                fDrawIndirectBuffer;
     SkAutoSTMalloc<1024, GLDrawCmdInfo>   fGLDrawCmdsInfo;
     uint32_t                              fInstanceAttribsBufferUniqueId;
     int                                   fInstanceAttribsBaseInstance;
 
     class GLBatch;
 
     typedef InstancedRendering INHERITED;
 };
 
 }
 
 #endif