Adds MUSViewsInit

components/mus/public/cpp/view_tree_connection.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_VIEW_TREE_CONNECTION_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_VIEW_TREE_CONNECTION_H_
 
 #include <string>
 
 #include "components/mus/public/cpp/types.h"
 #include "components/mus/public/interfaces/view_tree.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
 
 namespace mus {
 
 class View;
 class ViewTreeDelegate;
 
 // Encapsulates a connection to a view tree. A unique connection is made
 // every time an app is embedded.
 class ViewTreeConnection {
  public:
+  enum class CreateType {
+    // Indicates Create() should wait for OnEmbed(). If true, the
+    // ViewTreeConnection returned from Create() will have its root, otherwise
+    // the ViewTreeConnection will get the root at a later time.
+    WAIT_FOR_EMBED,
+    DONT_WAIT_FOR_EMBED
+  };
+
   virtual ~ViewTreeConnection() {}
 
   // The returned ViewTreeConnection instance owns itself, and is deleted when
   // the last root is destroyed or the connection to the service is broken.
   static ViewTreeConnection* Create(
       ViewTreeDelegate* delegate,
-      mojo::InterfaceRequest<mojo::ViewTreeClient> request);
+      mojo::InterfaceRequest<mojo::ViewTreeClient> request,
+      CreateType create_type);
 
   // Returns the root of this connection.
   virtual View* GetRoot() = 0;
 
   // Returns a View known to this connection.
   virtual View* GetViewById(Id id) = 0;
 
   // Returns the focused view; null if focus is not yet known or another app is
   // focused.
   virtual View* GetFocusedView() = 0;
 
   // Creates and returns a new View (which is owned by the ViewManager). Views
   // are initially hidden, use SetVisible(true) to show.
   virtual View* CreateView() = 0;
 
   // Returns true if ACCESS_POLICY_EMBED_ROOT was specified.
   virtual bool IsEmbedRoot() = 0;
 
   // Returns the id for this connection.
   virtual ConnectionSpecificId GetConnectionId() = 0;
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_VIEW_TREE_CONNECTION_H_