Consolidates view_manager typedefs

mojo/services/public/cpp/view_manager/view_manager_types.h

Index: mojo/services/public/cpp/view_manager/view_manager_types.h
diff --git a/mojo/services/public/cpp/view_manager/view_manager_types.h b/mojo/services/public/cpp/view_manager/view_manager_types.h
index 204f08117a5f6b02619a65544758adaeb030c427..09f48f47716dce6076cfb4bdd211b49dd0346e5f 100644
--- a/mojo/services/public/cpp/view_manager/view_manager_types.h
+++ b/mojo/services/public/cpp/view_manager/view_manager_types.h
@@ -13,13 +13,13 @@
 namespace mojo {
 namespace view_manager {
 
-typedef uint32_t TransportChangeId;
-typedef uint16_t TransportConnectionId;
-typedef uint32_t TransportNodeId;
-typedef uint32_t TransportViewId;
+// Used to identify nodes, views and change ids.
+typedef uint32_t Id;
 
-typedef uint16_t TransportConnectionSpecificNodeId;
-typedef uint16_t TransportConnectionSpecificViewId;
+// Used to identify a connection as well as a connection specific view or node
+// id. For example, the Id for a node consists of the ConnectionSpecificId of
+// the connection and the ConnectionSpecificId of the node.
+typedef uint16_t ConnectionSpecificId;
 
 }  // namespace view_manager
 }  // namespace mojo