Reland: mash: Fix MusPropertyMirrorAsh for owned properties; add test.

ash/public/cpp/mus_property_mirror_ash.cc

Index: ash/public/cpp/mus_property_mirror_ash.cc
diff --git a/ash/public/cpp/mus_property_mirror_ash.cc b/ash/public/cpp/mus_property_mirror_ash.cc
new file mode 100644
index 0000000000000000000000000000000000000000..25ddc91fbe390511e6bfe7ebf109378addccc693
--- /dev/null
+++ b/ash/public/cpp/mus_property_mirror_ash.cc
@@ -0,0 +1,54 @@
+// Copyright 2017 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 "ash/public/cpp/mus_property_mirror_ash.h"
+
+#include "ash/public/cpp/window_properties.h"
+#include "ui/aura/client/aura_constants.h"
+
+namespace {
+
+template <typename T>
+void MirrorOwnedProperty(aura::Window* window,
+                         aura::Window* root_window,
+                         const aura::WindowProperty<T*>* key) {
+  T* value = window->GetProperty(key);
+  if (!value)
+    root_window->ClearProperty(key);
+  else
+    root_window->SetProperty(key, new T(*value));
+}
+
+}  // namespace
+
+namespace ash {
+
+MusPropertyMirrorAsh::MusPropertyMirrorAsh() {}
+MusPropertyMirrorAsh::~MusPropertyMirrorAsh() {}
+
+void MusPropertyMirrorAsh::MirrorPropertyFromWidgetWindowToRootWindow(
+    aura::Window* window,
+    aura::Window* root_window,
+    const void* key) {
+  if (key == kPanelAttachedKey) {
+    bool value = window->GetProperty(kPanelAttachedKey);
+    root_window->SetProperty(kPanelAttachedKey, value);
+  } else if (key == kShelfItemTypeKey) {
+    int32_t value = window->GetProperty(kShelfItemTypeKey);
+    root_window->SetProperty(kShelfItemTypeKey, value);
+  } else if (key == aura::client::kAppIconKey) {
+    MirrorOwnedProperty(window, root_window, aura::client::kAppIconKey);
+  } else if (key == aura::client::kAppIdKey) {
+    MirrorOwnedProperty(window, root_window, aura::client::kAppIdKey);
+  } else if (key == aura::client::kDrawAttentionKey) {
+    bool value = window->GetProperty(aura::client::kDrawAttentionKey);
+    root_window->SetProperty(aura::client::kDrawAttentionKey, value);
+  } else if (key == aura::client::kTitleKey) {
+    MirrorOwnedProperty(window, root_window, aura::client::kTitleKey);
+  } else if (key == aura::client::kWindowIconKey) {
+    MirrorOwnedProperty(window, root_window, aura::client::kWindowIconKey);
+  }
+}
+
+}  // namespace ash