Initial CL to create Reorder command builder behind a flag

src/gpu/GrReorderCommandBuilder.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 GrInOrderCommandBuilder_DEFINED
-#define GrInOrderCommandBuilder_DEFINED
+#ifndef GrReorderCommandBuilder_DEFINED
+#define GrReorderCommandBuilder_DEFINED
 
 #include "GrCommandBuilder.h"
 
-class GrInOrderCommandBuilder : public GrCommandBuilder {
+class GrReorderCommandBuilder : public GrCommandBuilder {
 public:
     typedef GrCommandBuilder::Cmd Cmd;
     typedef GrCommandBuilder::State State;
 
-    GrInOrderCommandBuilder(GrGpu* gpu) : INHERITED(gpu) { }
+    GrReorderCommandBuilder(GrGpu* gpu) : INHERITED(gpu) {}
 
     Cmd* recordDrawBatch(State*, GrBatch*) override;
     Cmd* recordStencilPath(const GrPipelineBuilder&,
                            const GrPathProcessor*,
                            const GrPath*,
                            const GrScissorState&,
-                           const GrStencilSettings&) override;
+                           const GrStencilSettings&) override {
+        SkFAIL("Unsupported\n");
+        return NULL;
+    }
+
     Cmd* recordDrawPath(State*,
                         const GrPathProcessor*,
                         const GrPath*,
-                        const GrStencilSettings&) override;
+                        const GrStencilSettings&) override {
+        SkFAIL("Unsupported\n");
+        return NULL;
+    }
+
     Cmd* recordDrawPaths(State*,
                          GrInOrderDrawBuffer*,
                          const GrPathProcessor*,
                          const GrPathRange*,
                          const void*,
                          GrDrawTarget::PathIndexType,
                          const float transformValues[],
                          GrDrawTarget::PathTransformType ,
                          int,
                          const GrStencilSettings&,
-                         const GrDrawTarget::PipelineInfo&) override;
+                         const GrDrawTarget::PipelineInfo&) override {
+        SkFAIL("Unsupported\n");
+        return NULL;
+    }
 
 private:
     typedef GrCommandBuilder INHERITED;
 
 };
 
 #endif