Start app shim when app launched.

apps/app_shim/app_shim_handler_mac.h

Index: apps/app_shim/app_shim_handler_mac.h
diff --git a/apps/app_shim/app_shim_handler_mac.h b/apps/app_shim/app_shim_handler_mac.h
index e4a35fbd488adc9e3493bb672c270a2b52d4ee23..c24b340d9b7f7c8bad1198fc77441087f8e71431 100644
--- a/apps/app_shim/app_shim_handler_mac.h
+++ b/apps/app_shim/app_shim_handler_mac.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "apps/app_shim/app_shim_launch.h"
+
 class Profile;
 
 namespace apps {
@@ -46,8 +48,9 @@ class AppShimHandler {
 
   // Invoked by the shim host when the shim process is launched. The handler
   // must return true if successful, or false to indicate back to the shim
-  // process that it should close.
-  virtual bool OnShimLaunch(Host* host) = 0;
+  // process that it should close. |launch_now| indicates whether to launch the
+  // associated app.
+  virtual bool OnShimLaunch(Host* host, AppShimLaunchType launch_type) = 0;
 
   // Invoked by the shim host when the connection to the shim process is closed.
   virtual void OnShimClose(Host* host) = 0;