Routes WindowManager functionality through the view manager

mojo/services/view_manager/public/interfaces/view_manager.mojom

Index: mojo/services/view_manager/public/interfaces/view_manager.mojom
diff --git a/mojo/services/view_manager/public/interfaces/view_manager.mojom b/mojo/services/view_manager/public/interfaces/view_manager.mojom
index 3bd8f1ecdd8d4d28d8701946524d8a87314a9310..0a2564eeceb1470a6033806a928f8839c14b84d8 100644
--- a/mojo/services/view_manager/public/interfaces/view_manager.mojom
+++ b/mojo/services/view_manager/public/interfaces/view_manager.mojom
@@ -142,6 +142,14 @@ interface ViewManagerService {
            ServiceProvider&? services,
            ServiceProvider? exposed_services) => (bool success);
   Embed(uint32 view_id, ViewManagerClient client) => (bool success);
+
+  // Requests the WindowManager to perform an action on the specified view.
+  // It's up to the WindowManager to decide what |action| is.
+  //
+  // TODO(sky): nuke this. This is here to guarantee the state of the
+  // WindowManager matches that of the ViewManager at the time the client
+  // invokes the function. When we can enforce ordering this won't be necessary.
+  PerformAction(uint32 view_id, string action) => (bool success);
 };
 
 // Changes to views are not sent to the connection that originated the
@@ -214,4 +222,9 @@ interface ViewManagerClient {
 
   // Invoked when an event is targeted at the specified view.
   OnViewInputEvent(uint32 view, mojo.Event event) => ();
+
+  // Invoked solely on the WindowManager. See comments in PerformAction() above
+  // for details.
+  // TODO(sky): nuke this.
+  OnPerformAction(uint32 view_id, string action) => (bool success);
 };