mus: move View Manager to components/mus/vm

components/mus/ids.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_IDS_H_
-#define COMPONENTS_MUS_IDS_H_
-
-#include "components/mus/public/cpp/types.h"
-#include "components/mus/public/cpp/util.h"
-
-namespace mus {
-
-// Connection id is used to indicate no connection. That is, no ViewTreeImpl
-// ever gets this id.
-const ConnectionSpecificId kInvalidConnectionId = 0;
-
-// Adds a bit of type safety to view ids.
-struct ViewId {
-  ViewId(ConnectionSpecificId connection_id, ConnectionSpecificId view_id)
-      : connection_id(connection_id), view_id(view_id) {}
-  ViewId() : connection_id(0), view_id(0) {}
-
-  bool operator==(const ViewId& other) const {
-    return other.connection_id == connection_id && other.view_id == view_id;
-  }
-
-  bool operator!=(const ViewId& other) const { return !(*this == other); }
-
-  ConnectionSpecificId connection_id;
-  ConnectionSpecificId view_id;
-};
-
-inline ViewId ViewIdFromTransportId(Id id) {
-  return ViewId(HiWord(id), LoWord(id));
-}
-
-inline Id ViewIdToTransportId(const ViewId& id) {
-  return (id.connection_id << 16) | id.view_id;
-}
-
-// Returns a ViewId that is reserved to indicate no view. That is, no view will
-// ever be created with this id.
-inline ViewId InvalidViewId() {
-  return ViewId(kInvalidConnectionId, 0);
-}
-
-// Returns a root view id with a given index offset.
-inline ViewId RootViewId(uint16_t index) {
-  return ViewId(kInvalidConnectionId, 2 + index);
-}
-
-}  // namespace mus
-
-#endif  // COMPONENTS_MUS_IDS_H_