Updates subpixel positioning and hinting when DSF is changed

ui/gfx/font.h

Index: ui/gfx/font.h
diff --git a/ui/gfx/font.h b/ui/gfx/font.h
index b65423175b811c98c9cead7d7c21f52e67b97537..1ddc2975af628ca829afb17eccb5f3cf7e181c51 100644
--- a/ui/gfx/font.h
+++ b/ui/gfx/font.h
@@ -9,6 +9,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
+#include "ui/gfx/font_render_params.h"
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ -95,7 +96,7 @@ class GFX_EXPORT Font {
   int GetFontSize() const;
 
   // Returns an object describing how the font should be rendered.
-  const FontRenderParams& GetFontRenderParams() const;
+  FontRenderParams GetFontRenderParams() const;
 
   // Returns the native font handle.
   // Lifetime lore: