Implementation of the "Redirect URLs to Packaged Apps" feature.

chrome/common/extensions/extension_messages.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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 599 matching lines @@
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_AddEventToActivityLog,
                     std::string /* extension_id */,
                     ExtensionHostMsg_APIActionOrEvent_Params)
 
 // Sent by the renderer to log a DOM action to the extension activity log.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_AddDOMActionToActivityLog,
                      std::string /* extension_id */,
                      ExtensionHostMsg_DOMAction_Params)
 
 // Notifies the browser process that a tab has started or stopped matching
-// certain conditions.  This message is sent in response to several events:
+// certain conditions. This message is sent in response to several events:
 //
 // * ExtensionMsg_WatchPages was received, updating the set of conditions.
 // * A new page is loaded.  This will be sent after ViewHostMsg_FrameNavigate.
 //   Currently this only fires for the main frame.
 // * Something changed on an existing frame causing the set of matching searches
 //   to change.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_OnWatchedPageChange,
                     std::vector<std::string> /* Matching CSS selectors */)