Initial CL to create Reorder command builder behind a flag

src/gpu/GrReorderCommandBuilder.h

Index: src/gpu/GrReorderCommandBuilder.h
diff --git a/src/gpu/GrInOrderCommandBuilder.h b/src/gpu/GrReorderCommandBuilder.h
similarity index 70%
copy from src/gpu/GrInOrderCommandBuilder.h
copy to src/gpu/GrReorderCommandBuilder.h
index 164db92811cf20fd8289f54757eed2eb47ef2cce..99a2c11c27a2e12703997d240dfe0aae6cb26227 100644
--- a/src/gpu/GrInOrderCommandBuilder.h
+++ b/src/gpu/GrReorderCommandBuilder.h
@@ -5,28 +5,36 @@
  * 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*,
@@ -37,7 +45,10 @@ public:
                          GrDrawTarget::PathTransformType ,
                          int,
                          const GrStencilSettings&,
-                         const GrDrawTarget::PipelineInfo&) override;
+                         const GrDrawTarget::PipelineInfo&) override {
+        SkFAIL("Unsupported\n");
+        return NULL;
+    }
 
 private:
     typedef GrCommandBuilder INHERITED;