Initial CL to create Reorder command builder behind a flag

src/gpu/GrTargetCommands.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 GrTargetCommands_DEFINED
 #define GrTargetCommands_DEFINED
 
@@ skipping 47 matching lines @@
         int              fMarkerID;
         CmdType          fType;
     };
 
     void reset();
     void flush(GrInOrderDrawBuffer*);
 
 private:
     friend class GrCommandBuilder;
     friend class GrInOrderDrawBuffer; // This goes away when State becomes just a pipeline
+    friend class GrReorderCommandBuilder;
 
     typedef GrGpu::DrawArgs DrawArgs;
 
     void recordXferBarrierIfNecessary(const GrPipeline&, GrInOrderDrawBuffer*);
 
     // TODO: This can be just a pipeline once paths are in batch, and it should live elsewhere
     struct State : public SkNVRefCnt<State> {
         // TODO get rid of the prim proc parameter when we use batch everywhere
         State(const GrPrimitiveProcessor* primProc = NULL)
             : fPrimitiveProcessor(primProc)
@@ skipping 177 matching lines @@
 
     CmdBuffer* cmdBuffer() { return &fCmdBuffer; }
     GrBatchTarget* batchTarget() { return &fBatchTarget; }
 
     CmdBuffer                           fCmdBuffer;
     GrBatchTarget                       fBatchTarget;
 };
 
 #endif