add point of interest API

experimental/skpdiff/SkCLImageDiffer.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 SkCLImageDiffer_DEFINED
 #define SkCLImageDiffer_DEFINED
 
@@ skipping 75 matching lines @@
 };
 
 /**
  * A OpenCL differ that measures the percentage of different corresponding pixels. If the two images
  * are not the same size or have no pixels, the result will always be zero.
  */
 class SkDifferentPixelsImageDiffer : public SkCLImageDiffer {
 public:
     virtual const char* getName() SK_OVERRIDE;
     virtual int queueDiff(SkBitmap* baseline, SkBitmap* test) SK_OVERRIDE;
+    virtual void deleteDiff(int id) SK_OVERRIDE;
     virtual bool isFinished(int id) SK_OVERRIDE;
     virtual double getResult(int id) SK_OVERRIDE;
+    virtual int getPointsOfInterestCount(int id) SK_OVERRIDE;
+    virtual SkIPoint* getPointsOfInterest(int id) SK_OVERRIDE;
 
 protected:
     virtual bool onInit() SK_OVERRIDE;
 
 private:
-    struct QueuedDiff {
-        bool finished;
-        double result;
-        cl_mem baseline;
-        cl_mem test;
-        cl_mem resultsBuffer;
-    };
+    struct QueuedDiff;
 
     SkTDArray<QueuedDiff> fQueuedDiffs;
     cl_kernel fKernel;
 
     typedef SkCLImageDiffer INHERITED;
 };
 
 #endif