Initial implementation of GPU no filter NinePatch

TBR=bsalomon@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/1454933002
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index 0c0987a..1408a71 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -119,6 +119,11 @@
     void drawImageRect(const SkDraw&, const SkImage*, const SkRect* src, const SkRect& dst,
                        const SkPaint&, SkCanvas::SrcRectConstraint) override;
 
+    void drawImageNine(const SkDraw& draw, const SkImage* image, const SkIRect& center,
+                       const SkRect& dst, const SkPaint& paint) override;
+    void drawBitmapNine(const SkDraw& draw, const SkBitmap& bitmap, const SkIRect& center,
+                        const SkRect& dst, const SkPaint& paint) override;
+
     void flush() override;
 
     void onAttachToCanvas(SkCanvas* canvas) override;