Add onFontNameChanged event to Font Settings API

chrome/browser/extensions/extension_preference_helpers.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/extensions/extension_preference_helpers.h"
 
+#include "chrome/browser/extensions/extension_prefs.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/profiles/profile.h"
+
 namespace {
 
 const char kIncognitoPersistent[] = "incognito_persistent";
 const char kIncognitoSessionOnly[] = "incognito_session_only";
 const char kRegular[] = "regular";
 
+const char kNotControllable[] = "not_controllable";
+const char kControlledByOtherExtensions[] = "controlled_by_other_extensions";
+const char kControllableByThisExtension[] = "controllable_by_this_extension";
+const char kControlledByThisExtension[] = "controlled_by_this_extension";
+
 }  // namespace
 
 namespace extension_preference_helpers {
 
 bool StringToScope(const std::string& s, ExtensionPrefsScope* scope) {
   if (s == kRegular)
     *scope = kExtensionPrefsScopeRegular;
   else if (s == kIncognitoPersistent)
     *scope = kExtensionPrefsScopeIncognitoPersistent;
   else if (s == kIncognitoSessionOnly)
     *scope = kExtensionPrefsScopeIncognitoSessionOnly;
   else
     return false;
   return true;
 }
 
+const char* GetLevelOfControl(
+    Profile* profile,
+    const std::string& extension_id,
+    const std::string& browser_pref,
+    bool incognito) {
+  PrefService* prefs = incognito ? profile->GetOffTheRecordPrefs()
+                                 : profile->GetPrefs();
+  const PrefService::Preference* pref =
+      prefs->FindPreference(browser_pref.c_str());
+  CHECK(pref);
+  ExtensionPrefs* ep = profile->GetExtensionService()->extension_prefs();
+
+  if (!pref->IsExtensionModifiable())
+    return kNotControllable;
+
+  if (ep->DoesExtensionControlPref(extension_id, browser_pref, incognito))
+    return kControlledByThisExtension;
+
+  if (ep->CanExtensionControlPref(extension_id, browser_pref, incognito))
+    return kControllableByThisExtension;
+
+  return kControlledByOtherExtensions;
+}
+
 }  // namespace extension_preference_helpers