Add a new field "source" in launchData of chrome.app.runtime.onLaunched() to trace launch source.

apps/app_load_service.h

Index: apps/app_load_service.h
diff --git a/apps/app_load_service.h b/apps/app_load_service.h
index aa9cc984078fc2ac0138b65b2a1a44d7de4e4d55..bd5d292bc8fa6ad79d4f5e72bcb8c05cea601307 100644
--- a/apps/app_load_service.h
+++ b/apps/app_load_service.h
@@ -30,9 +30,9 @@ class AppLoadService : public KeyedService,
                        public extensions::ExtensionRegistryObserver {
  public:
   enum PostReloadActionType {
-    LAUNCH,
+    LAUNCH_FOR_RELOAD,
     RESTART,
-    LAUNCH_WITH_COMMAND_LINE,
+    LAUNCH_FOR_LOAD_AND_LAUNCH,
   };
 
   struct PostReloadAction {