Updates subpixel positioning and hinting when DSF is changed

ui/gfx/font.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_FONT_H_
 #define UI_GFX_FONT_H_
 
 #include <string>
 
 #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"
 
 namespace gfx {
 
 struct FontRenderParams;
 class PlatformFont;
 
 // Font provides a wrapper around an underlying font. Copy and assignment
 // operators are explicitly allowed, and cheap.
@@ skipping 66 matching lines @@
   // Returns the specified font name in UTF-8.
   std::string GetFontName() const;
 
   // Returns the actually used font name in UTF-8.
   std::string GetActualFontNameForTesting() const;
 
   // Returns the font size in pixels.
   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:
   // Windows: This handle is owned by the Font object, and should not be
   //          destroyed by the caller.
   // Mac:     The object is owned by the system and should not be released.
   // Gtk:     This handle is created on demand, and must be freed by calling
   //          pango_font_description_free() when the caller is done using it or
   //          by using ScopedPangoFontDescription.
   NativeFont GetNativeFont() const;
 
   // Raw access to the underlying platform font implementation. Can be
   // static_cast to a known implementation type if needed.
   PlatformFont* platform_font() const { return platform_font_.get(); }
 
  private:
   // Wrapped platform font implementation.
   scoped_refptr<PlatformFont> platform_font_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_H_