Enable subpixel positioning for internal display with dsf larger than 1.0

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 453a008ed9900c3fc8851159f75d660a320f905c..fd06ea826bf3b804f43bdcc78dbb2d4e6b0eee20 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -852,6 +852,8 @@ void Shell::Init(const ShellInitParams& init_params) {
   if (!display_initialized)
     display_manager_->InitDefaultDisplay();
 
+  display_manager_->InitFontParams();
+
   // Install the custom factory first so that views::FocusManagers for Tray,
   // Shelf, and WallPaper could be created by the factory.
   views::FocusManagerFactory::Install(new AshFocusManagerFactory);