Add webstorePrivate API for installing bundles of extensions.

chrome/browser/extensions/crx_installer.h

Index: chrome/browser/extensions/crx_installer.h
diff --git a/chrome/browser/extensions/crx_installer.h b/chrome/browser/extensions/crx_installer.h
index e83342d7041c317a9f5e1ee66c78ad40fe86ae9b..883ee1759991759c265e5be699f1070fa2fd1ea5 100644
--- a/chrome/browser/extensions/crx_installer.h
+++ b/chrome/browser/extensions/crx_installer.h
@@ -68,6 +68,9 @@ class CrxInstaller
     // Whether to use a bubble notification when an app is installed, instead of
     // the default behavior of transitioning to the new tab page.
     bool use_app_installed_bubble;
+
+    // Whether the whitelist entry should bypass the normal post install UI.
+    bool skip_post_install_ui;
   };
 
   // Exempt the next extension install with |id| from displaying a confirmation