Experimental alignment layout manager using a property on the views

ui/views/fill_attribute.cc

Index: ui/views/fill_attribute.cc
diff --git a/ui/views/fill_attribute.cc b/ui/views/fill_attribute.cc
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index 0000000000000000000000000000000000000000..50b86d737904e76d22e7b09dbaa68bdd2ea890fb
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+++ b/ui/views/fill_attribute.cc
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+// Copyright (c) 2016 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 "ui/views/fill_attribute.h"
+#include "ui/views/anchor_attribute.h"
+
+namespace views {
+
+AttributeId FillAttribute::Identity() const {
+  return GetAttributeId<FillAttribute>();
+}
+
+void FillAttribute::SetFill(Fill fill) {
+  if (this->fill() != fill) {
+    this->GetContent() = fill;
+    View *view = this->view();
+    if (view) {
+      AnchorAttribute *anchors = nullptr;
+      if (view->attributes().Find(anchors))
+        anchors->Notification(Attribute::NotifyType::AttributeAdded, this);
+    }
+  }
+}
+
+} // namespace views