print on unused uniforms in debug builds

src/gpu/gl/GrGLProgramDataManager.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 GrGLProgramDataManager_DEFINED
 #define GrGLProgramDataManager_DEFINED
 
@@ skipping 88 matching lines @@
 
     struct Uniform {
         GrGLint     fVSLocation;
         GrGLint     fFSLocation;
         SkDEBUGCODE(
             GrSLType    fType;
             int         fArrayCount;
         );
     };
 
+#ifdef SK_DEBUG
+    void printUnused(const Uniform&) const;
+#else
+    void printUnused(const Uniform&) const {}
+#endif
+
     SkTArray<Uniform, true> fUniforms;
     GrGLGpu* fGpu;
 
     typedef SkRefCnt INHERITED;
 };
 #endif