Start app shim when app launched.

apps/app_shim/app_shim_messages.h

 // Copyright 2013 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.
 
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
+#include "base/files/file_path.h"
 #include "ipc/ipc_message_macros.h"
 
 #define IPC_MESSAGE_START AppShimMsgStart
 
 // Signals that a previous LaunchApp message has been processed, and lets the
-// app shim process know whether the app launch was successful.
+// app shim process know whether it was registered successfully.
 IPC_MESSAGE_CONTROL1(AppShimMsg_LaunchApp_Done,
                      bool /* succeeded */)
 
-// Tells the main Chrome process to launch a particular app with the given
-// profile name and app id.
-IPC_MESSAGE_CONTROL2(AppShimHostMsg_LaunchApp,
-                     std::string /* profile name */,
-                     std::string /* app id */)
+// Signals to the main Chrome process that a shim has started indicating the
+// profile and app_id that the shim should be associated with and whether to
+// launch the app immediately.
+IPC_MESSAGE_CONTROL3(AppShimHostMsg_LaunchApp,
+                     base::FilePath /* profile dir */,
+                     std::string /* app id */,
+                     bool /* launch now */)
 
 // Sent when the user has indicated a desire to focus the app, either by
 // clicking on the app's icon in the dock or by selecting it with Cmd+Tab. In
 // response, Chrome brings the app's windows to the foreground.
 IPC_MESSAGE_CONTROL0(AppShimHostMsg_FocusApp)