make drawImage a virtual on SkDevice

src/image/SkImage_Gpu.cpp

Index: src/image/SkImage_Gpu.cpp
diff --git a/src/image/SkImage_Gpu.cpp b/src/image/SkImage_Gpu.cpp
index 7ccff17d9b09fd6946685b81dce25e865c966245..eec0d1976001a7a3fddc23f797ca46089cde020d 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -26,15 +26,6 @@ SkShader* SkImage_Gpu::onNewShader(SkShader::TileMode tileX,
     return SkShader::CreateBitmapShader(fBitmap, tileX, tileY, localMatrix);
 }
 
-void SkImage_Gpu::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const {
-    canvas->drawBitmap(fBitmap, x, y, paint);
-}
-
-void SkImage_Gpu::onDrawRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
-                                   const SkPaint* paint) const {
-    canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
-}
-
 SkSurface* SkImage_Gpu::onNewSurface(const SkImageInfo& info, const SkSurfaceProps& props) const {
     GrContext* ctx = this->getTexture()->getContext();
     // TODO: Change signature of onNewSurface to take a budgeted param.