Factor out VisualBench timing code into a helper class

tools/sk_tool_utils.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "sk_tool_utils.h"
 #include "sk_tool_utils_flags.h"
 
@@ skipping 327 matching lines @@
                 } else {
                     norm = leftUp;
                 }    
             }
 
             norm_to_rgb(bm, x, y, norm);
         }
     }
 }
 
+void make_big_path(SkPath& path) {
+    #include "BigPathBench.inc"
+}
+
 }  // namespace sk_tool_utils