Make "source" a required argument of AppLaunchParams and fill in the argument in all call points.

athena/extensions/chrome/extensions_delegate_impl.cc

Index: athena/extensions/chrome/extensions_delegate_impl.cc
diff --git a/athena/extensions/chrome/extensions_delegate_impl.cc b/athena/extensions/chrome/extensions_delegate_impl.cc
index feedc8e7375fb4b924ef9f621efc8ef89c60c997..2678f35a0a56b6c84707849103ae2bd31bd5a0cd 100644
--- a/athena/extensions/chrome/extensions_delegate_impl.cc
+++ b/athena/extensions/chrome/extensions_delegate_impl.cc
@@ -11,6 +11,7 @@
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/extensions/app_launch_params.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "extensions/browser/extension_registry.h"
@@ -59,10 +60,9 @@ class ChromeExtensionsDelegate : public ExtensionsDelegate {
       return false;
 
     int event_flags = 0;
-    AppLaunchParams params(Profile::FromBrowserContext(context),
-                           extension,
-                           event_flags,
-                           chrome::HOST_DESKTOP_TYPE_ASH);
+    AppLaunchParams params(Profile::FromBrowserContext(context), extension,
+                           event_flags, chrome::HOST_DESKTOP_TYPE_ASH,
+                           extensions::SOURCE_APP_LAUNCHER);
     // TODO(oshima): rename HOST_DESTOP_TYPE_ASH to non native desktop.
 
     if (app_id == extensions::kWebStoreAppId) {