mozart: Initial commit of the view manager.

services/ui/view_manager/view_layout_request.cc

+// Copyright 2015 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 "base/logging.h"
+#include "services/ui/view_manager/view_layout_request.h"
+
+namespace view_manager {
+
+ViewLayoutRequest::ViewLayoutRequest(
+    mojo::ui::ViewLayoutParamsPtr layout_params)
+    : layout_params_(layout_params.Pass()),
+      was_dispatched_(false),
+      issued_(false) {}
+
+ViewLayoutRequest::~ViewLayoutRequest() {
+  if (!was_dispatched_)
+    DispatchLayoutInfo(nullptr);
+}
+
+void ViewLayoutRequest::AddCallback(const ViewLayoutCallback& callback) {
+  DCHECK(!was_dispatched_);
+  callbacks_.emplace_back(callback);
+}
+
+void ViewLayoutRequest::DispatchLayoutInfo(mojo::ui::ViewLayoutInfo* info) {
+  DCHECK(!was_dispatched_);
+  was_dispatched_ = true;
+  for (const auto& callback : callbacks_)
+    callback.Run(info ? info->Clone() : nullptr);
+}
+
+}  // namespace view_manager