app_shell: Change flag for loading apps to --load-app and only launch

extensions/common/switches.cc

Index: extensions/common/switches.cc
diff --git a/extensions/common/switches.cc b/extensions/common/switches.cc
index 773597109038c801169c140294e5e755e0e24336..144c13549859413573b56d0faba53294fc744464 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -78,6 +78,10 @@ const char kExtensionsOnChromeURLs[] = "extensions-on-chrome-urls";
 // Whether to force developer mode extensions highlighting.
 const char kForceDevModeHighlighting[] = "force-dev-mode-highlighting";
 
+// Path to a comma-separated list of apps to load at startup.  The first app in
+// the list will be launched.
+const char kLoadApps[] = "load-apps";
+
 // Whether or not mime handler view guests are enabled.
 const char kMimeHandlerView[] = "mime-handler-view";