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 dd31047ba74d7c2c7599516e7cc4a5e61ebc461c..ce5ce5b4d1861ddaeb13b4ab6b7ca565a8c58965 100644
--- a/apps/app_shim/app_shim_host_mac.h
+++ b/apps/app_shim/app_shim_host_mac.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "apps/app_shim/app_shim_handler_mac.h"
+#include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "ipc/ipc_listener.h"
@@ -41,7 +42,7 @@ class AppShimHost : public IPC::Listener,
  protected:
 
   // Used internally; virtual so they can be mocked for testing.
-  virtual Profile* FetchProfileForDirectory(const std::string& profile_dir);
+  virtual Profile* FetchProfileForDirectory(const base::FilePath& profile_dir);
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
@@ -51,11 +52,13 @@ 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(base::FilePath profile_dir,
+                   std::string app_id,
+                   apps::AppShimLaunchType launch_type);
 
   // 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