Add some missing header include guards

src/gpu/GrReducedClip.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 GrReducedClip_DEFINED
+#define GrReducedClip_DEFINED
+
 #include "SkClipStack.h"
 #include "SkTLList.h"
 
 namespace GrReducedClip {
 
 typedef SkTLList<SkClipStack::Element> ElementList;
 
 enum InitialState {
     kAllIn_InitialState,
     kAllOut_InitialState,
@@ skipping 15 matching lines @@
  */
 SK_API void ReduceClipStack(const SkClipStack& stack,
                             const SkIRect& queryBounds,
                             ElementList* result,
                             int32_t* resultGenID,
                             InitialState* initialState,
                             SkIRect* tighterBounds = NULL,
                             bool* requiresAA = NULL);
 
 } // namespace GrReducedClip
+
+#endif