Updates subpixel positioning and hinting when DSF is changed

ui/gfx/platform_font_mac.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_PLATFORM_FONT_MAC_H_
 #define UI_GFX_PLATFORM_FONT_MAC_H_
 
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "ui/gfx/font_render_params.h"
@@ skipping 11 matching lines @@
   // Overridden from PlatformFont:
   Font DeriveFont(int size_delta, int style) const override;
   int GetHeight() const override;
   int GetBaseline() const override;
   int GetCapHeight() const override;
   int GetExpectedTextWidth(int length) const override;
   int GetStyle() const override;
   std::string GetFontName() const override;
   std::string GetActualFontNameForTesting() const override;
   int GetFontSize() const override;
-  const FontRenderParams& GetFontRenderParams() const override;
+  const FontRenderParams& GetFontRenderParams() override;
   NativeFont GetNativeFont() const override;
 
  private:
   PlatformFontMac(const std::string& font_name, int font_size, int font_style);
   ~PlatformFontMac() override;
 
   // Calculates and caches the font metrics and inits |render_params_|.
   void CalculateMetricsAndInitRenderParams();
 
   // The NSFont instance for this object. If this object was constructed from an
@@ skipping 16 matching lines @@
 
   // Details about how the font should be rendered.
   FontRenderParams render_params_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontMac);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_MAC_H_