Initial CL to create Reorder command builder behind a flag

src/gpu/GrCommandBuilder.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 GrCommandBuilder_DEFINED
 #define GrCommandBuilder_DEFINED
 
 #include "GrTargetCommands.h"
 
 class GrInOrderDrawBuffer;
 
 class GrCommandBuilder : ::SkNoncopyable {
 public:
     typedef GrTargetCommands::Cmd Cmd;
     typedef GrTargetCommands::State State;
 
-    GrCommandBuilder(GrGpu* gpu) : fCommands(gpu) { }
+    static GrCommandBuilder* Create(GrGpu* gpu, bool reorder);
 
     virtual ~GrCommandBuilder() {}
 
     void reset() { fCommands.reset(); }
     void flush(GrInOrderDrawBuffer* iodb) { fCommands.flush(iodb); }
 
     virtual Cmd* recordClearStencilClip(const SkIRect& rect,
                                         bool insideClip,
                                         GrRenderTarget* renderTarget);
     virtual Cmd* recordDiscard(GrRenderTarget*);
@@ skipping 31 matching lines @@
 protected:
     typedef GrTargetCommands::DrawBatch DrawBatch;
     typedef GrTargetCommands::StencilPath StencilPath;
     typedef GrTargetCommands::DrawPath DrawPath;
     typedef GrTargetCommands::DrawPaths DrawPaths;
     typedef GrTargetCommands::Clear Clear;
     typedef GrTargetCommands::ClearStencilClip ClearStencilClip;
     typedef GrTargetCommands::CopySurface CopySurface;
     typedef GrTargetCommands::XferBarrier XferBarrier;
 
+    GrCommandBuilder(GrGpu* gpu) : fCommands(gpu) {}
+
     GrTargetCommands::CmdBuffer* cmdBuffer() { return fCommands.cmdBuffer(); }
     GrBatchTarget* batchTarget() { return fCommands.batchTarget(); }
 
 private:
     GrTargetCommands fCommands;
 
 };
 
 #endif