Linux: Detect Unity as a desktop environment.

chrome/browser/ui/gtk/gtk_theme_service.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/ui/gtk/gtk_theme_service.h"
 
 #include <gtk/gtk.h>
 
 #include <set>
 #include <string>
@@ skipping 597 matching lines @@
   return ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
       IDR_DEFAULT_FAVICON);
 }
 
 // static
 bool GtkThemeService::DefaultUsesSystemTheme() {
   scoped_ptr<base::Environment> env(base::Environment::Create());
 
   switch (base::nix::GetDesktopEnvironment(env.get())) {
     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
+    case base::nix::DESKTOP_ENVIRONMENT_UNITY:
     case base::nix::DESKTOP_ENVIRONMENT_XFCE:
       return true;
-    default:
+    case base::nix::DESKTOP_ENVIRONMENT_KDE3:
+    case base::nix::DESKTOP_ENVIRONMENT_KDE4:
+    case base::nix::DESKTOP_ENVIRONMENT_OTHER:
       return false;
   }
+  // Unless GetDesktopEnvironment() badly misbehaves, this should never happen.
+  NOTREACHED();
+  return false;
 }
 
 void GtkThemeService::ClearAllThemeData() {
   colors_.clear();
   tints_.clear();
 
   ThemeService::ClearAllThemeData();
 }
 
 void GtkThemeService::LoadThemePrefs() {
@@ skipping 511 matching lines @@
   cairo_new_path(cr);
   cairo_set_line_width(cr, 1.0);
   cairo_move_to(cr, start_x, allocation.y);
   cairo_line_to(cr, start_x, allocation.y + allocation.height);
   cairo_stroke(cr);
   cairo_destroy(cr);
   cairo_pattern_destroy(pattern);
 
   return TRUE;
 }