Make GrGLEffects use an interface to append their code.

src/ports/SkDebug_win.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #include "SkTypes.h"
 
 static const size_t kBufferSize = 2048;
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <Windows.h>
 
 void SkDebugf(const char format[], ...) {
     char    buffer[kBufferSize + 1];
     va_list args;
     va_start(args, format);
     vsnprintf(buffer, kBufferSize, format, args);
+    vprintf(format, args);
     va_end(args);
 
     OutputDebugStringA(buffer);
-    printf(buffer);
 }