[linux] Allow font to use below 1.0f scale

chrome/browser/ui/libgtkui/gtk_ui.h

Index: chrome/browser/ui/libgtkui/gtk_ui.h
diff --git a/chrome/browser/ui/libgtkui/gtk_ui.h b/chrome/browser/ui/libgtkui/gtk_ui.h
index c15bf00ed94855fbc4004b03572f017544220fa9..108c46270f268df1cf63caba742ae07e5ca22ded 100644
--- a/chrome/browser/ui/libgtkui/gtk_ui.h
+++ b/chrome/browser/ui/libgtkui/gtk_ui.h
@@ -105,7 +105,7 @@ class Gtk2UI : public views::LinuxUI {
                   std::vector<ui::TextEditCommandAuraLinux>* commands) override;
 
   // ui::Views::LinuxUI:
-  void UpdateDeviceScaleFactor(float device_scale_factor) override;
+  void UpdateDeviceScaleFactor() override;
   float GetDeviceScaleFactor() const override;
 
  private:
@@ -200,7 +200,7 @@ class Gtk2UI : public views::LinuxUI {
   // instance.
   NativeThemeGetter native_theme_overrider_;
 
-  float device_scale_factor_;
+  float device_scale_factor_ = 1.0f;

[Evan Stade, 2016/11/03 16:38:03]

seems like we should init things in the same place (at least those that are
init'd with const expressions), either all in the ctor init list or all in this
file

I am ambivalent about which one and I dunno what the style guide has to say
about it, if anything.

[oshima, 2016/11/05 15:15:05]

I moved default_font_xxx to the header.

 
   DISALLOW_COPY_AND_ASSIGN(Gtk2UI);
 };