Start app shim when app launched.

apps/app_shim/app_shim_host_mac.cc

Index: apps/app_shim/app_shim_host_mac.cc
diff --git a/apps/app_shim/app_shim_host_mac.cc b/apps/app_shim/app_shim_host_mac.cc
index ad63e93038ff20ad397037c5dbe7e262728ef63a..a7e3ead3ba616bf9373a4c23f6b276458594a912 100644
--- a/apps/app_shim/app_shim_host_mac.cc
+++ b/apps/app_shim/app_shim_host_mac.cc
@@ -62,7 +62,9 @@ bool AppShimHost::Send(IPC::Message* message) {
   return channel_->Send(message);
 }
 
-void AppShimHost::OnLaunchApp(std::string profile_dir, std::string app_id) {
+void AppShimHost::OnLaunchApp(std::string profile_dir,
+                              std::string app_id,
+                              bool launch_now) {
   DCHECK(CalledOnValidThread());
   DCHECK(!profile_);
   if (profile_) {
@@ -71,10 +73,15 @@ void AppShimHost::OnLaunchApp(std::string profile_dir, std::string app_id) {
     return;
   }
 
-  profile_ = FetchProfileForDirectory(profile_dir);
+  if (!(profile_ = FetchProfileForDirectory(profile_dir))) {
+    Send(new AppShimMsg_LaunchApp_Done(false));
+    return;
+  }
+
   app_id_ = app_id;
+
   apps::AppShimHandler* handler = apps::AppShimHandler::GetForAppMode(app_id_);
-  bool success = handler && handler->OnShimLaunch(this);
+  bool success = handler && handler->OnShimLaunch(this, launch_now);
   Send(new AppShimMsg_LaunchApp_Done(success));
 }