First cut at custom user style sheets.

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/tab_contents/tab_contents.h"
 
 #include "app/gfx/text_elider.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/auto_reset.h"
@@ skipping 301 matching lines @@
                  NotificationService::AllSources());
   registrar_.Add(this, NotificationType::BOOKMARK_MODEL_LOADED,
                  NotificationService::AllSources());
   registrar_.Add(this, NotificationType::RENDER_WIDGET_HOST_DESTROYED,
                  NotificationService::AllSources());
 #if defined(OS_LINUX)
   registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
                  NotificationService::AllSources());
 #endif
 
+  registrar_.Add(this, NotificationType::USER_STYLE_SHEET_UPDATED,
+                 NotificationService::AllSources());
+
   // Register for notifications about content setting changes.
   registrar_.Add(this, NotificationType::CONTENT_SETTINGS_CHANGED,
                  NotificationService::AllSources());
 
   // Keep a global copy of the previous search string (if any).
   static string16 global_last_search = string16();
   last_search_prepopulate_text_ = &global_last_search;
 
   // Set-up the showing of the omnibox search infobar if applicable.
   if (OmniboxSearchHint::IsEnabled(profile))
@@ skipping 2222 matching lines @@
   DCHECK(prefs);
   if (prefs->GetBoolean(prefs::kAlternateErrorPagesEnabled)) {
     url = google_util::AppendGoogleLocaleParam(
         GURL(google_util::kLinkDoctorBaseURL));
     url = google_util::AppendGoogleTLDParam(url);
   }
   return url;
 }
 
 WebPreferences TabContents::GetWebkitPrefs() {
-  PrefService* prefs = render_view_host()->process()->profile()->GetPrefs();
+  Profile* profile = render_view_host()->process()->profile();
   bool is_dom_ui = false;
-  return RenderViewHostDelegateHelper::GetWebkitPrefs(prefs, is_dom_ui);
+  return RenderViewHostDelegateHelper::GetWebkitPrefs(profile, is_dom_ui);
 }
 
 void TabContents::OnIgnoredUIEvent() {
   if (constrained_window_count()) {
     ConstrainedWindow* window = *constrained_window_begin();
     window->FocusConstrainedWindow();
   }
 }
 
 void TabContents::OnJSOutOfMemory() {
@@ skipping 195 matching lines @@
 
 #if defined(OS_LINUX)
     case NotificationType::BROWSER_THEME_CHANGED: {
       renderer_preferences_util::UpdateFromSystemSettings(
           &renderer_preferences_, profile());
       render_view_host()->SyncRendererPrefs();
       break;
     }
 #endif
 
+    case NotificationType::USER_STYLE_SHEET_UPDATED:
+      UpdateWebPreferences();
+      break;
+
     case NotificationType::CONTENT_SETTINGS_CHANGED: {
       Details<HostContentSettingsMap::ContentSettingsDetails>
           settings_details(details);
       NavigationEntry* entry = controller_.GetActiveEntry();
       GURL entry_url;
       std::string host;
       if (entry) {
         entry_url = entry->url();
         host = entry_url.host();
       }
@@ skipping 59 matching lines @@
   render_view_host()->JavaScriptMessageBoxClosed(reply_msg, success, prompt);
 }
 
 void TabContents::SetSuppressMessageBoxes(bool suppress_message_boxes) {
   set_suppress_javascript_messages(suppress_message_boxes);
 }
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = CharacterEncoding::GetCanonicalEncodingNameByAliasName(encoding);
 }