linux: Pass subpixel positioning setting to WebKit.

chrome/browser/renderer_preferences_util.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 "chrome/browser/renderer_preferences_util.h"
 
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/common/renderer_preferences.h"
 
 #if defined(TOOLKIT_GTK)
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
+#elif defined(USE_ASH)
+#include "base/command_line.h"
+#include "ui/base/ui_base_switches.h"
 #endif
 
 namespace renderer_preferences_util {
 
 void UpdateFromSystemSettings(
     content::RendererPreferences* prefs, Profile* profile) {
 #if defined(TOOLKIT_GTK)
   gtk_util::UpdateGtkFontSettings(prefs);
 
   GtkThemeService* theme_service = GtkThemeService::GetFrom(profile);
 
   prefs->focus_ring_color = theme_service->get_focus_ring_color();
   prefs->thumb_active_color = theme_service->get_thumb_active_color();
   prefs->thumb_inactive_color = theme_service->get_thumb_inactive_color();
   prefs->track_color = theme_service->get_track_color();
   prefs->active_selection_bg_color =
       theme_service->get_active_selection_bg_color();
   prefs->active_selection_fg_color =
       theme_service->get_active_selection_fg_color();
   prefs->inactive_selection_bg_color =
       theme_service->get_inactive_selection_bg_color();
   prefs->inactive_selection_fg_color =
       theme_service->get_inactive_selection_fg_color();
 #elif defined(USE_ASH)
+  // TODO(derat): This code and GetCairoFontOptions() from ui/gfx/pango_util.cc
+  // should get their settings from the same place.
+  prefs->use_subpixel_positioning =
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableTextSubpixelPositioning);
+
   // This color is 0x544d90fe modulated with 0xffffff.
   prefs->active_selection_bg_color = SkColorSetRGB(0xCB, 0xE4, 0xFA);
   prefs->active_selection_fg_color = SK_ColorBLACK;
   prefs->inactive_selection_bg_color = SkColorSetRGB(0xEA, 0xEA, 0xEA);
   prefs->inactive_selection_fg_color = SK_ColorBLACK;
 #endif
 
   prefs->enable_referrers =
       profile->GetPrefs()->GetBoolean(prefs::kEnableReferrers);
   prefs->default_zoom_level =
       profile->GetPrefs()->GetDouble(prefs::kDefaultZoomLevel);
 }
 
 }  // renderer_preferences_util