Updates subpixel positioning and hinting when DSF is changed

ui/gfx/platform_font_win.cc

 // 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.
 
 #include "ui/gfx/platform_font_win.h"
 
 #include <algorithm>
 #include <dwrite.h>
 #include <math.h>
 #include <windows.h>
@@ skipping 293 matching lines @@
                            &localized_font_name[0]);
   if (length <= 0)
     return GetFontName();
   return base::SysWideToUTF8(localized_font_name);
 }
 
 int PlatformFontWin::GetFontSize() const {
   return font_ref_->font_size();
 }
 
-const FontRenderParams& PlatformFontWin::GetFontRenderParams() const {
+const FontRenderParams& PlatformFontWin::GetFontRenderParams() {
   CR_DEFINE_STATIC_LOCAL(const gfx::FontRenderParams, params,
       (gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(false), NULL)));
   return params;
 }
 
 NativeFont PlatformFontWin::GetNativeFont() const {
   return font_ref_->hfont();
 }
 
 void PlatformFontWin::SetDirectWriteFactory(IDWriteFactory* factory) {
@@ skipping 271 matching lines @@
   return new PlatformFontWin(native_font);
 }
 
 // static
 PlatformFont* PlatformFont::CreateFromNameAndSize(const std::string& font_name,
                                                   int font_size) {
   return new PlatformFontWin(font_name, font_size);
 }
 
 }  // namespace gfx