Add makeSpecial calls to SkGpuDevice

src/gpu/SkGpuDevice.h

Index: src/gpu/SkGpuDevice.h
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index 56d934fe7d87fe74b452fa8e5c585c08a82ec625..85764467cb50cb277fa2983563ad140dce5bf2db 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -131,9 +131,11 @@ public:
     void drawBitmapNine(const SkDraw& draw, const SkBitmap& bitmap, const SkIRect& center,
                         const SkRect& dst, const SkPaint& paint) override;
 
-    sk_sp<SkSpecialImage> asSpecial();
-    void drawSpecial(const SkDraw& draw, SkSpecialImage*,
-                     int left, int top, const SkPaint& paint);
+    void drawSpecial(const SkDraw&, SkSpecialImage*,
+                     int left, int top, const SkPaint& paint) override;
+    sk_sp<SkSpecialImage> makeSpecial(const SkBitmap&) override;
+    sk_sp<SkSpecialImage> makeSpecial(SkImage*) override;
+    sk_sp<SkSpecialImage> snapSpecial() override;
 
     void flush() override;