pdfviewr: include what you use (stdio)

experimental/PdfViewer/SkTracker.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTracker_DEFINED
 #define SkTracker_DEFINED
 
+#include <stdio.h>
+
 #include "SkBitmap.h"
 #include "SkPoint.h"
 
 // TODO(edisonn): draw plan from point! - list of draw ops of a point, like a tree!
 // TODO(edisonn): Minimal PDF to draw some points - remove everything that it is not needed,
 //                save pdf uncompressed
 
 #define MAX_TRACKING_POINTS 100
 
 /** \class SkTracker
@@ skipping 195 matching lines @@
     int fCntExpectedTouched;
 
     SkIPoint fExpectedUntouched[MAX_TRACKING_POINTS];
     SkColor fBeforeUntouched[MAX_TRACKING_POINTS];
     int fCntExpectedUntouched;
 
     int fHits;
 };
 
 #endif  // SkTracker_DEFINED