Adds MUSViewsInit

components/mus/public/cpp/lib/view_tree_client_impl.cc

 // 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.
 
 #include "components/mus/public/cpp/lib/view_tree_client_impl.h"
 
 #include "components/mus/public/cpp/lib/view_private.h"
 #include "components/mus/public/cpp/util.h"
 #include "components/mus/public/cpp/view_observer.h"
 #include "components/mus/public/cpp/view_tree_connection.h"
@@ skipping 52 matching lines @@
         client, !parents.empty() ? parents.back() : NULL, views[i]);
     if (!last_view)
       root = view;
     last_view = view;
   }
   return root;
 }
 
 ViewTreeConnection* ViewTreeConnection::Create(
     ViewTreeDelegate* delegate,
-    mojo::InterfaceRequest<mojo::ViewTreeClient> request) {
-  return new ViewTreeClientImpl(delegate, request.Pass());
+    mojo::InterfaceRequest<mojo::ViewTreeClient> request,
+    CreateType create_type) {
+  ViewTreeClientImpl* client = new ViewTreeClientImpl(delegate, request.Pass());
+  if (create_type == CreateType::WAIT_FOR_EMBED)
+    client->WaitForEmbed();
+  return client;
 }
 
 ViewTreeClientImpl::ViewTreeClientImpl(
     ViewTreeDelegate* delegate,
     mojo::InterfaceRequest<mojo::ViewTreeClient> request)
     : connection_id_(0),
       next_id_(1),
       delegate_(delegate),
       root_(nullptr),
       capture_view_(nullptr),
@@ skipping 20 matching lines @@
   // Delete the non-owned views last. In the typical case these are roots. The
   // exception is the window manager and embed roots, which may know about
   // other random views that it doesn't own.
   // NOTE: we manually delete as we're a friend.
   for (size_t i = 0; i < non_owned.size(); ++i)
     delete non_owned[i];
 
   delegate_->OnConnectionLost(this);
 }
 
+void ViewTreeClientImpl::WaitForEmbed() {
+  DCHECK(!root_);
+  // OnEmbed() is the first function called.
+  binding_.WaitForIncomingMethodCall();
+  // TODO(sky): deal with pipe being closed before we get OnEmbed().
+}
+
 void ViewTreeClientImpl::DestroyView(Id view_id) {
   DCHECK(tree_);
   tree_->DeleteView(view_id, ActionCompletedCallback());
 }
 
 void ViewTreeClientImpl::AddChild(Id child_id, Id parent_id) {
   DCHECK(tree_);
   tree_->AddView(parent_id, child_id, ActionCompletedCallback());
 }
 
@@ skipping 304 matching lines @@
 void ViewTreeClientImpl::OnActionCompleted(bool success) {
   if (!change_acked_callback_.is_null())
     change_acked_callback_.Run();
 }
 
 mojo::Callback<void(bool)> ViewTreeClientImpl::ActionCompletedCallback() {
   return [this](bool success) { OnActionCompleted(success); };
 }
 
 }  // namespace mus