Start app shim when app launched.

apps/app_shim/app_shim_host_mac.h

Index: apps/app_shim/app_shim_host_mac.h
diff --git a/apps/app_shim/app_shim_host_mac.h b/apps/app_shim/app_shim_host_mac.h
index e68380c314abb8f66d97f6b5459d19df68e458a8..e2bd18953a7c720561c7e799b4933a16869963ae 100644
--- a/apps/app_shim/app_shim_host_mac.h
+++ b/apps/app_shim/app_shim_host_mac.h
@@ -51,11 +51,13 @@ class AppShimHost : public IPC::Listener,
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
  private:
-  // The app shim process is requesting that an app be launched. Once it has
-  // done so the |profile| and |app_id| are stored, and all future messages
-  // from the app shim relate to the app it launched. It is an error for the
-  // app shim to send multiple launch messages.
-  void OnLaunchApp(std::string profile, std::string app_id);
+  // The app shim process is requesting to be associated with the given profile
+  // and app_id. Once the profile and app_id are stored, and all future
+  // messages from the app shim relate to this app. The app is launched
+  // immediately if |launch_now| is true.
+  void OnLaunchApp(std::string profile_dir,
+                   std::string app_id,
+                   bool launch_now);
 
   // Called when the app shim process notifies that the app should be brought
   // to the front (i.e. the user has clicked on the app's icon in the dock or