Don't declare displayCache variable if PROGRAM_CACHE_STATS not defined.

src/gpu/gl/GrGpuGL_program.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGpuGL.h"
 
 #include "GrEffect.h"
 #include "GrGLEffect.h"
 #include "SkRTConf.h"
 #include "SkTSearch.h"
 
+#ifdef PROGRAM_CACHE_STATS
 SK_CONF_DECLARE(bool, c_DisplayCache, "gpu.displayCache", false,
                 "Display program cache usage.");
+#endif
 
 typedef GrGLUniformManager::UniformHandle UniformHandle;
 
 struct GrGpuGL::ProgramCache::Entry {
     SK_DECLARE_INST_COUNT_ROOT(Entry);
     Entry() : fProgram(NULL), fLRUStamp(0) {}
 
     SkAutoTUnref<GrGLProgram>   fProgram;
     unsigned int                fLRUStamp;
 };
@@ skipping 345 matching lines @@
                          GrGLAttribTypeToLayout(attribType).fCount,
                          GrGLAttribTypeToLayout(attribType).fType,
                          GrGLAttribTypeToLayout(attribType).fNormalized,
                          stride,
                          reinterpret_cast<GrGLvoid*>(
                          vertexOffsetInBytes + vertexAttrib->fOffset));
     }
 
     attribState->disableUnusedArrays(this, usedAttribArraysMask, false);
 }