Add some missing header include guards

src/gpu/GrAAConvexPathRenderer.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
+#ifndef GrAAConvexPathRenderer_DEFINED
+#define GrAAConvexPathRenderer_DEFINED
+
 #include "GrPathRenderer.h"
 
-
 class GrAAConvexPathRenderer : public GrPathRenderer {
 public:
     GrAAConvexPathRenderer();
 
     virtual bool canDrawPath(const SkPath& path,
                              const SkStrokeRec& stroke,
                              const GrDrawTarget* target,
                              bool antiAlias) const SK_OVERRIDE;
 
 protected:
     virtual bool onDrawPath(const SkPath& path,
                             const SkStrokeRec& stroke,
                             GrDrawTarget* target,
                             bool antiAlias) SK_OVERRIDE;
 };
+
+#endif