add JSONP option to output of skpdiff

experimental/skpdiff/SkDiffContext.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 SkDiffContext_DEFINED
 #define SkDiffContext_DEFINED
 
@@ skipping 67 matching lines @@
      *                     "result": 1,
      *                     "pointsOfInterest": [
      *                         [285,279],
      *                     ]
      *                 }
      *             ]
      *         }
      *     ]
      * }
      *
-     * @param stream The stream to output the diff to
+     * @param stream   The stream to output the diff to
+     * @param useJSONP True to adding padding to the JSON output to make it cross-site requestable.
      */
-    void outputRecords(SkWStream& stream);
+    void outputRecords(SkWStream& stream, bool useJSONP);
 
 private:
     struct DiffData {
         const char* fDiffName;
         double fResult;
         SkTDArray<SkIPoint> fPointsOfInterest;
     };
 
     struct DiffRecord {
         SkString           fBaselinePath;
         SkString               fTestPath;
         SkTArray<DiffData>        fDiffs;
         DiffRecord*                fNext;
     };
 
     // We use linked list for the records so that their pointers remain stable. A resizable array
     // might change its pointers, which would make it harder for async diffs to record their
     // results.
     DiffRecord * fRecords;
 
     SkImageDiffer** fDiffers;
     int fDifferCount;
 };
 
 #endif