When a font family pref changes to the empty string, pass it to WebKit.

chrome/browser/extensions/api/font_settings/font_settings_api.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.
 
 // Font Settings Extension API implementation.
 
 #include "chrome/browser/extensions/api/font_settings/font_settings_api.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/preference/preference_helpers.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/api/font_settings.h"
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/pref_names_util.h"
 #include "content/public/browser/font_list_async.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 
 #if defined(OS_WIN)
 #include "ui/gfx/font.h"
 #include "ui/gfx/platform_font_win.h"
 #endif
 
 namespace extensions {
@@ skipping 15 matching lines @@
 const char kOnDefaultFixedFontSizeChanged[] =
     "fontSettings.onDefaultFixedFontSizeChanged";
 const char kOnDefaultFontSizeChanged[] =
     "fontSettings.onDefaultFontSizeChanged";
 const char kOnFontChanged[] = "fontSettings.onFontChanged";
 const char kOnMinimumFontSizeChanged[] =
     "fontSettings.onMinimumFontSizeChanged";
 
 // Format for font name preference paths.
 const char kWebKitFontPrefFormat[] = "webkit.webprefs.fonts.%s.%s";
-const char kWebKitFontPrefPrefix[] = "webkit.webprefs.fonts.";
 
 // Gets the font name preference path for |generic_family| and |script|. If
 // |script| is NULL, uses prefs::kWebKitCommonScript.
 std::string GetFontNamePrefPath(fonts::GenericFamily generic_family_enum,
                                 fonts::ScriptCode script_enum) {
   std::string script = fonts::ToString(script_enum);
   if (script.empty())
     script = prefs::kWebKitCommonScript;
   std::string generic_family = fonts::ToString(generic_family_enum);
   return StringPrintf(kWebKitFontPrefFormat,
                       generic_family.c_str(),
                       script.c_str());
 }
 
-// Extracts the generic family and script from font name pref path |pref_path|.
-bool ParseFontNamePrefPath(std::string pref_path,
-                           std::string* generic_family,
-                           std::string* script) {
-  if (!StartsWithASCII(pref_path, kWebKitFontPrefPrefix, true))
-    return false;
-
-  size_t start = strlen(kWebKitFontPrefPrefix);
-  size_t pos = pref_path.find('.', start);
-  if (pos == std::string::npos || pos + 1 == pref_path.length())
-    return false;
-  *generic_family = pref_path.substr(start, pos - start);
-  *script = pref_path.substr(pos + 1);
-  return true;
-}
-
 // Returns the localized name of a font so that it can be matched within the
 // list of system fonts. On Windows, the list of system fonts has names only
 // for the system locale, but the pref value may be in the English name.
 std::string MaybeGetLocalizedFontName(const std::string& font_name) {
 #if defined(OS_WIN)
   if (!font_name.empty()) {
     gfx::Font font(font_name, 12);  // dummy font size
     return static_cast<gfx::PlatformFontWin*>(font.platform_font())->
         GetLocalizedFontName();
   }
@@ skipping 74 matching lines @@
   PrefEventMap::iterator iter = pref_event_map_.find(*pref_name);
   if (iter != pref_event_map_.end()) {
     const std::string& event_name = iter->second.first;
     const std::string& key = iter->second.second;
     OnFontPrefChanged(pref_service, *pref_name, event_name, key, incognito);
     return;
   }
 
   std::string generic_family;
   std::string script;
-  if (ParseFontNamePrefPath(*pref_name, &generic_family, &script)) {
+  if (pref_names_util::ParseFontNamePrefPath(*pref_name, &generic_family,
+                                             &script)) {
     OnFontNamePrefChanged(pref_service, *pref_name, generic_family, script,
                           incognito);
     return;
   }
 
   NOTREACHED();
 }
 
 void FontSettingsEventRouter::OnFontNamePrefChanged(
     PrefService* pref_service,
@@ skipping 286 matching lines @@
 
 const char* SetMinimumFontSizeFunction::GetPrefName() {
   return prefs::kWebKitMinimumFontSize;
 }
 
 const char* SetMinimumFontSizeFunction::GetKey() {
   return kPixelSizeKey;
 }
 
 }  // namespace extensions