Revert of Remove deprecated paths from image filter infrastructure.

src/gpu/SkGpuDevice.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGpuDevice_DEFINED
 #define SkGpuDevice_DEFINED
 
@@ skipping 112 matching lines @@
                         const SkRect& dst, const SkPaint& paint) override;
 
     void flush() override;
 
     void onAttachToCanvas(SkCanvas* canvas) override;
     void onDetachFromCanvas() override;
 
     const SkBitmap& onAccessBitmap() override;
     bool onAccessPixels(SkPixmap*) override;
 
+    bool canHandleImageFilter(const SkImageFilter*) override;
+    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+                             const SkImageFilter::Context&,
+                             SkBitmap*, SkIPoint*) override;
+
+    bool filterTexture(GrContext*, GrTexture*, int width, int height, const SkImageFilter*,
+                       const SkImageFilter::Context&,
+                       SkBitmap* result, SkIPoint* offset);
+
+    static SkImageFilter::Cache* NewImageFilterCache();
+
     // for debugging purposes only
     void drawTexture(GrTexture*, const SkRect& dst, const SkPaint&);
 
 protected:
     bool onReadPixels(const SkImageInfo&, void*, size_t, int, int) override;
     bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) override;
     bool onShouldDisableLCD(const SkPaint&) const final;
 
     /**  PRIVATE / EXPERIMENTAL -- do not call */
     virtual bool EXPERIMENTAL_drawPicture(SkCanvas* canvas, const SkPicture* picture,
@@ skipping 108 matching lines @@
 
     void drawSpriteWithFilter(const SkDraw&, const SkBitmap&, int x, int y,
                               const SkPaint&) override;
 
     friend class GrAtlasTextContext;
     friend class SkSurface_Gpu;      // for access to surfaceProps
     typedef SkBaseDevice INHERITED;
 };
 
 #endif