Adds more to viewmanager

mojo/services/view_manager/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 MOJO_SERVICES_VIEW_MANAGER_IDS_H_
 #define MOJO_SERVICES_VIEW_MANAGER_IDS_H_
 
 #include "mojo/services/view_manager/view_manager_export.h"
 
 namespace mojo {
 namespace services {
 namespace view_manager {
 
 // Adds a bit of type safety to node ids.
 struct MOJO_VIEW_MANAGER_EXPORT NodeId {
   NodeId(uint16_t connection_id, uint16_t node_id)
       : connection_id(connection_id),
         node_id(node_id) {}
   NodeId() : connection_id(0), node_id(0) {}
 
   bool operator==(const NodeId& other) const {
     return other.connection_id == connection_id &&
         other.node_id == node_id;
   }
 
+  bool operator!=(const NodeId& other) const {
+    return !(*this == other);
+  }
+
   uint16_t connection_id;
   uint16_t node_id;
 };
 
 // Adds a bit of type safety to view ids.
 struct MOJO_VIEW_MANAGER_EXPORT ViewId {
   ViewId(uint16_t connection_id, uint16_t 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);
+  }
+
   uint16_t connection_id;
   uint16_t view_id;
 };
 
 // Functions for converting to/from structs and transport values.
 inline uint16_t FirstIdFromTransportId(uint32_t id) {
   return static_cast<uint16_t>((id >> 16) & 0xFFFF);
 }
 
 inline uint16_t SecondIdFromTransportId(uint32_t id) {
   return static_cast<uint16_t>(id & 0xFFFF);
 }
 
 inline NodeId NodeIdFromTransportId(uint32_t id) {
   return NodeId(FirstIdFromTransportId(id), SecondIdFromTransportId(id));
 }
 
 inline uint32_t NodeIdToTransportId(const NodeId& id) {
   return (id.connection_id << 16) | id.node_id;
 }
 
 inline ViewId ViewIdFromTransportId(uint32_t id) {
   return ViewId(FirstIdFromTransportId(id), SecondIdFromTransportId(id));
 }
 
+inline uint32_t ViewIdToTransportId(const ViewId& id) {
+  return (id.connection_id << 16) | id.view_id;
+}
+
 }  // namespace view_manager
 }  // namespace services
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_IDS_H_