Enhance chrome.app.window API for shelf integration with restore support

chrome/browser/ui/extensions/app_launch_params.h

Index: chrome/browser/ui/extensions/app_launch_params.h
diff --git a/chrome/browser/ui/extensions/app_launch_params.h b/chrome/browser/ui/extensions/app_launch_params.h
index 492855aa020bf1148c5dcba387e88ff533dbb30b..f1b265eb8a6f8b249342be5035ed85e8f59d7474 100644
--- a/chrome/browser/ui/extensions/app_launch_params.h
+++ b/chrome/browser/ui/extensions/app_launch_params.h
@@ -40,6 +40,10 @@ struct AppLaunchParams {
   // The extension to load.
   std::string extension_id;
 
+  // An id that can be passed to an app when launched in order to support
+  // multiple shelf items per app.
+  std::string launch_id;
+
   // The container type to launch the application in.
   extensions::LaunchContainer container;