remove fClipStack and attach/deattach-from-canvas

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 128 matching lines @@
                         const SkRect& dst, const SkPaint& paint) override;
 
     void drawSpecial(const SkDraw&, SkSpecialImage*,
                      int left, int top, const SkPaint& paint) override;
     sk_sp<SkSpecialImage> makeSpecial(const SkBitmap&) override;
     sk_sp<SkSpecialImage> makeSpecial(const SkImage*) override;
     sk_sp<SkSpecialImage> snapSpecial() override;
 
     void flush() override;
 
-    void onAttachToCanvas(SkCanvas* canvas) override;
-    void onDetachFromCanvas() override;
-
     bool onAccessPixels(SkPixmap*) override;
 
     // 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:
     // We want these unreffed in DrawContext, RenderTarget, GrContext order.
     SkAutoTUnref<GrContext>         fContext;
     sk_sp<GrRenderTarget>           fRenderTarget;
     sk_sp<GrDrawContext>            fDrawContext;
 
-    SkAutoTUnref<const SkClipStack> fClipStack;
     SkIPoint                        fClipOrigin;
     GrClipStackClip                 fClip;
     SkISize                         fSize;
     bool                            fOpaque;
 
     enum Flags {
         kNeedClear_Flag = 1 << 0,  //!< Surface requires an initial clear
         kIsOpaque_Flag  = 1 << 1,  //!< Hint from client that rendering to this device will be
                                    //   opaque even if the config supports alpha.
     };
@@ skipping 95 matching lines @@
                                                   const SkImageInfo&,
                                                   int sampleCount,
                                                   const SkSurfaceProps*);
 
     friend class GrAtlasTextContext;
     friend class SkSurface_Gpu;      // for access to surfaceProps
     typedef SkBaseDevice INHERITED;
 };
 
 #endif