Add unittest for ArcNotificationContentView

ui/arc/notification/arc_notification_surface_impl.cc

+// 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 "ui/arc/notification/arc_notification_surface_impl.h"
+
+#include "base/logging.h"
+#include "components/exo/notification_surface.h"
+#include "components/exo/surface.h"
+#include "ui/aura/window.h"
+#include "ui/views/controls/native/native_view_host.h"
+
+namespace arc {
+
+// Handles notification surface role of a given surface.
+ArcNotificationSurfaceImpl::ArcNotificationSurfaceImpl(
+    exo::NotificationSurface* surface)
+    : surface_(surface) {
+  DCHECK(surface);
+}
+
+gfx::Size ArcNotificationSurfaceImpl::GetSize() const {
+  return surface_->GetSize();
+}
+
+void ArcNotificationSurfaceImpl::Attach(
+    views::NativeViewHost* native_view_host) {
+  DCHECK(!native_view_host_);
+  native_view_host_ = native_view_host;
+  native_view_host->Attach(surface_->window());
+}
+
+void ArcNotificationSurfaceImpl::Detach() {
+  if (!native_view_host_) {
+    NOTREACHED();
+    return;
+  }
+  DCHECK_EQ(surface_->window(), native_view_host_->native_view());
+  native_view_host_->Detach();
+  native_view_host_ = nullptr;
+}
+
+bool ArcNotificationSurfaceImpl::IsAttached() const {
+  return native_view_host_;
+}
+
+aura::Window* ArcNotificationSurfaceImpl::GetWindow() const {
+  return surface_->window();
+}
+
+aura::Window* ArcNotificationSurfaceImpl::GetContentWindow() const {
+  DCHECK(surface_->window());
+  DCHECK(!surface_->window()->children().empty());

[hidehiko, 2017/06/15 15:26:20]

If above DCHECK fails (i.e. if surface_->window() is nullptr), this would crash.
On the other hand, you handles |native_view_host_| == nullptr case to avoid the
cras at L34. What is the policy?

[yoshiki, 2017/06/16 11:29:08]

Previously double-detach existed so we had null-check and return in Detach()
method. But it's now solved so let me remove the code in Detach() (and add
IsAttached() check in ArcNotificationContentService).

+
+  aura::Window* content_window = surface_->window()->children()[0];
+
+  DCHECK(!content_window);
+  DCHECK_EQ(exo::Surface::kSurfaceWindowName, content_window->GetName());
+
+  return content_window;
+}
+
+const std::string& ArcNotificationSurfaceImpl::GetNotificationKey() const {
+  return surface_->notification_key();
+}
+
+}  // namespace arc