move skpdiff into tools

experimental/skpdiff/SkPMetric.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 SkPMetric_DEFINED
-#define SkPMetric_DEFINED
-
-#include "SkTArray.h"
-#include "SkTDArray.h"
-
-#include "SkImageDiffer.h"
-
-/**
- * An image differ that uses the pdiff image metric to compare images.
- */
-class SkPMetric : public SkImageDiffer {
-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;
-
-private:
-    struct QueuedDiff {
-        bool finished;
-        double result;
-        SkTDArray<SkIPoint> poi;
-    };
-
-    SkTArray<QueuedDiff> fQueuedDiffs;
-
-    typedef SkImageDiffer INHERITED;
-};
-
-
-#endif