Allow installer::GetLocalizedString to return mode-specific strings.

chrome/installer/util/l10n_string_util.h

 // 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.
 //
 // This file contains helper functions for getting strings that are included in
 // our DLL for all languages (i.e., does not come from our language DLL).
 //
 // These resource strings are organized such that we can get a localized string
 // by taking the base resource ID and adding a language offset.  For example,
 // to get the resource id for the localized product name in en-US, we take
@@ skipping 13 matching lines @@
   virtual ~TranslationDelegate();
   virtual base::string16 GetLocalizedString(int installer_string_id) = 0;
 };
 
 // If we're in Chrome, the installer strings aren't in the binary, but are in
 // the localized pak files.  A TranslationDelegate must be provided so we can
 // load these strings.
 void SetTranslationDelegate(TranslationDelegate* delegate);
 
 // Given a string base id, return the localized version of the string based on
-// the system language.  This is used for shortcuts placed on the user's
-// desktop.  The string is retrieved from the TranslationDelegate if one has
-// been set.  Otherwise, the string is read from the binary's string table.
+// the system language. This is used for shortcuts placed on the user's desktop.
+// The string is retrieved from the TranslationDelegate if one has been set.
+// Otherwise, the string is read from the binary's string table. Certain
+// messages (see MODE_SPECIFIC_STRINGS in create_string_rc.py) are dynamically
+// mapped to a variant that is specific to the current install mode (e.g.,
+// IDS_INBOUND_MDNS_RULE_NAME is mapped to IDS_INBOUND_MDNS_RULE_NAME_CANARY for
+// canary Chrome).
 std::wstring GetLocalizedString(int base_message_id);
 
 // Returns the localized version of a string (obtained from GetLocalizedString)
 // with $1 replaced with |a|. Additionally, $$ is replaced by $.
 base::string16 GetLocalizedStringF(int base_message_id,
                                    const base::string16& a);
 
 // Given the system language, return a url that points to the localized eula.
 // The empty string is returned on failure.
 std::wstring GetLocalizedEulaResource();
 
 // Returns the language identifier of the translation currently in use.
 std::wstring GetCurrentTranslation();
 
+// Returns the mode-specific message id for |base_message_id| given the current
+// install mode. Returns |base_message_id| itself if it does not have per-mode
+// variants. See MODE_SPECIFIC_STRINGS in create_string_rc.py for details..
+int GetBaseMessageIdForMode(int base_message_id);
+
 }  // namespace installer.
 
 #endif  // CHROME_INSTALLER_UTIL_L10N_STRING_UTIL_H_