linux: Get font DPI from GTK.

chrome/browser/ui/libgtk2ui/gtk2_ui.h

 // Copyright (c) 2013 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 CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_
 #define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 52 matching lines @@
   // ui::LinuxInputMethodContextFactory:
   virtual scoped_ptr<ui::LinuxInputMethodContext> CreateInputMethodContext(
       ui::LinuxInputMethodContextDelegate* delegate) const OVERRIDE;
 
   // gfx::LinuxFontDelegate:
   virtual bool UseAntialiasing() const OVERRIDE;
   virtual gfx::FontRenderParams::Hinting GetHintingStyle() const OVERRIDE;
   virtual gfx::FontRenderParams::SubpixelRendering
       GetSubpixelRenderingStyle() const OVERRIDE;
   virtual std::string GetDefaultFontDescription() const OVERRIDE;
+  virtual double GetFontDPI() const OVERRIDE;
 
   // ui::LinuxShellDialog:
   virtual ui::SelectFileDialog* CreateSelectFileDialog(
       ui::SelectFileDialog::Listener* listener,
       ui::SelectFilePolicy* policy) const OVERRIDE;
 
   // ui::LinuxUI:
   virtual void Initialize() OVERRIDE;
   virtual gfx::Image GetThemeImageNamed(int id) const OVERRIDE;
   virtual bool GetColor(int id, SkColor* color) const OVERRIDE;
@@ skipping 179 matching lines @@
 }  // namespace libgtk2ui
 
 // Access point to the GTK2 desktop system. This should be the only symbol that
 // is exported in the library; everything else should be used through the
 // interface, because eventually this .so will be loaded through dlopen at
 // runtime so our main binary can conditionally load GTK2 or GTK3 or EFL or
 // QT or whatever.
 LIBGTK2UI_EXPORT views::LinuxUI* BuildGtk2UI();
 
 #endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_