Fix images drawn with the NineImagePainter class in high DPI.

ui/gfx/skia_util.h

Index: ui/gfx/skia_util.h
diff --git a/ui/gfx/skia_util.h b/ui/gfx/skia_util.h
index 92c886a4309f6c2a2a3edb617bf41d789cef8eca..0c759838b863f5443b238054e1b38ea9ce6ed0f7 100644
--- a/ui/gfx/skia_util.h
+++ b/ui/gfx/skia_util.h
@@ -47,6 +47,13 @@ GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShader(
     SkShader::TileMode tile_mode,
     const SkMatrix& local_matrix);
 
+// Creates a bitmap shader for the image rep with the passed in scale factor.
+GFX_EXPORT skia::RefPtr<SkShader> CreateImageRepShaderForScale(
+    const gfx::ImageSkiaRep& image_rep,
+    SkShader::TileMode tile_mode,
+    const SkMatrix& local_matrix,
+    SkScalar scale);
+
 // Creates a vertical gradient shader. The caller owns the shader.
 // Example usage to avoid leaks:
 GFX_EXPORT skia::RefPtr<SkShader> CreateGradientShader(int start_point,