Revert "Revert of remove unused SkCachingPixelRef (patchset #1 id:1 of https://codereview.chromium.…

src/lazy/SkCachingPixelRef.h

Index: src/lazy/SkCachingPixelRef.h
diff --git a/src/lazy/SkCachingPixelRef.h b/src/lazy/SkCachingPixelRef.h
deleted file mode 100644
index 1057441d5e4b1d7d5053c25f2696238687d33ee7..0000000000000000000000000000000000000000
--- a/src/lazy/SkCachingPixelRef.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * 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 SkCachingPixelRef_DEFINED
-#define SkCachingPixelRef_DEFINED
-
-#include "SkBitmapCache.h"
-#include "SkImageInfo.h"
-#include "SkImageGenerator.h"
-#include "SkPixelRef.h"
-
-class SkColorTable;
-
-/**
- *  PixelRef which defers decoding until SkBitmap::lockPixels() is
- *  called.  Caches the decoded images in the global
- *  SkScaledImageCache.  When the pixels are unlocked, this cache may
- *  or be destroyed before the next lock.  If so, onLockPixels will
- *  attempt to re-decode.
- *
- *  Decoding is handled by the SkImageGenerator
- */
-class SkCachingPixelRef : public SkPixelRef {
-public:
-    
-    /**
-     *  Takes ownership of SkImageGenerator.  If this method fails for
-     *  whatever reason, it will return false and immediatetely delete
-     *  the generator.  If it succeeds, it will modify destination
-     *  bitmap.
-     *
-     *  If Install fails or when the SkCachingPixelRef that is
-     *  installed into destination is destroyed, it will call
-     *  `delete` on the generator.  Therefore, generator should be
-     *  allocated with `new`.
-     */
-    static bool Install(SkImageGenerator* gen, SkBitmap* dst);
-
-protected:
-    virtual ~SkCachingPixelRef();
-    bool onNewLockPixels(LockRec*) override;
-    void onUnlockPixels() override;
-    bool onLockPixelsAreWritable() const override { return false; }
-
-    SkData* onRefEncodedData() override {
-        return fImageGenerator->refEncodedData();
-    }
-
-    bool onIsLazyGenerated() const override { return true; }
-
-private:
-    SkImageGenerator* const fImageGenerator;
-    bool                    fErrorInDecoding;
-    const size_t            fRowBytes;
-
-    SkBitmap                fLockedBitmap;
-
-    SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes);
-
-    typedef SkPixelRef INHERITED;
-};
-
-#endif  // SkCachingPixelRef_DEFINED