Changes container names and adds a couple of more

mash/wm/public/interfaces/container.mojom

Index: mash/wm/public/interfaces/container.mojom
diff --git a/mash/wm/public/interfaces/container.mojom b/mash/wm/public/interfaces/container.mojom
index 9a42eeb4fe5b7f505a57678e3f51b04b8e2c0519..5cd46932b747646dae6f265ef5b0027ef9a56fce 100644
--- a/mash/wm/public/interfaces/container.mojom
+++ b/mash/wm/public/interfaces/container.mojom
@@ -5,19 +5,29 @@
 module mash.wm.mojom;
 
 // Containers for windows. This list is in the z-order of the windows, however
-// they are actually built in a hierarchy (e.g. USER_WORKSPACE and LOGIN_WINDOWS
-// are siblings). See RootWindowController::CreateContainers() for the full
-// hierarchy. 
+// they are actually built in a hierarchy (e.g. USER and LOGIN are siblings).
+// See RootWindowController::CreateContainers() for the full hierarchy.
+//
+// NOTE: containers whose name starts with an earlier name are children.
+// For example, USER_BACKGROUND is a child of USER and USER_PRIVATE_WINDOWS is a
+// child of USER_PRIVATE.
 enum Container {
   ROOT = 0,
   ALL_USER_BACKGROUND,
-  USER_WORKSPACE,
+  USER,
   USER_BACKGROUND,
+  // Container that is hidden when screen is locked, child of USER.
   USER_PRIVATE,
-  USER_WINDOWS,
-  USER_ALWAYS_ON_TOP_WINDOWS,
-  USER_PRESENTATION_WINDOWS,
-  USER_SHELF,
+  // Windows with no explicit container end up here.
+  USER_PRIVATE_WINDOWS,
+  USER_PRIVATE_ALWAYS_ON_TOP_WINDOWS,
+  USER_PRIVATE_DOCKED_WINDOWS,
+  USER_PRIVATE_PRESENTATION_WINDOWS,
+  USER_PRIVATE_SHELF,
+  USER_PRIVATE_PANELS,
+  USER_PRIVATE_APP_LIST,
+  USER_PRIVATE_SYSTEM_MODAL,
+  LOGIN,
   LOGIN_WINDOWS,
   LOGIN_APP,    // TODO(beng): what about dialog boxes login opens?
   LOGIN_SHELF,
@@ -29,7 +39,7 @@ enum Container {
   SYSTEM_MODAL_WINDOWS,
   KEYBOARD,
   MENUS,
-  TOOLTIPS,
+  DRAG_AND_TOOLTIPS,
   COUNT
 };