Revert of remvoe duplicate impl for SkImageInfo flattening

include/core/SkBitmapDevice.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 SkBitmapDevice_DEFINED
 #define SkBitmapDevice_DEFINED
@@ skipping 240 matching lines @@
 private:
     friend class SkCanvas;
     friend struct DeviceCM; //for setMatrixClip
     friend class SkDraw;
     friend class SkDrawIter;
     friend class SkDeviceFilteredPaint;
     friend class SkDeviceImageFilterProxy;
 
     friend class SkSurface_Raster;
 
-    void init(SkBitmap::Config config, int width, int height, bool isOpaque);
-
     // used to change the backend's pixels (and possibly config/rowbytes)
     // but cannot change the width/height, so there should be no change to
     // any clip information.
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE;
 
     /**
      * Subclasses should override this to implement createCompatibleDevice.
      */
     virtual SkBaseDevice* onCreateCompatibleDevice(SkBitmap::Config config,
                                                    int width, int height,
                                                    bool isOpaque,
                                                    Usage usage) SK_OVERRIDE;
 
     /** Causes any deferred drawing to the device to be completed.
      */
     virtual void flush() SK_OVERRIDE {}
 
     SkBitmap    fBitmap;
 
     typedef SkBaseDevice INHERITED;
 };
 
 #endif // SkBitmapDevice_DEFINED