Implement and test aura::client::CaptureClient in views::NativeWidgetMus for plumbing (Set|Release)…

ui/views/mus/native_widget_mus_unittest.cc

 // Copyright 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/mus/native_widget_mus.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/tests/window_tree_client_impl_private.h"
@@ skipping 418 matching lines @@
       &ack_callback);
 
   // The widget was deleted.
   EXPECT_FALSE(widget.get());
 
   // The test took ownership of the callback and called it.
   EXPECT_FALSE(ack_callback);
   EXPECT_EQ(1, ack_callback_count());
 }
 
+TEST_F(NativeWidgetMusTest, SetAndReleaseCapture) {
+  std::unique_ptr<Widget> widget(CreateWidget(nullptr));
+  widget->Show();
+  View* content = new View;
+  widget->GetContentsView()->AddChildView(content);
+  internal::NativeWidgetPrivate* widget_private =
+      widget->native_widget_private();
+  mus::Window* mus_window =
+      static_cast<NativeWidgetMus*>(widget_private)->window();
+  EXPECT_FALSE(widget_private->HasCapture());
+  EXPECT_FALSE(mus_window->HasCapture());
+
+  widget->SetCapture(content);
+  EXPECT_TRUE(widget_private->HasCapture());
+  EXPECT_TRUE(mus_window->HasCapture());
+
+  widget->ReleaseCapture();
+  EXPECT_FALSE(widget_private->HasCapture());
+  EXPECT_FALSE(mus_window->HasCapture());

[sadrul, 2016/05/24 15:25:19]

Hm, because the mus WS is launched just once for all of the tests, it is
possible that this capture request can a failure in some other test. Keep an eye
on this test being flaky, or other capture-related test being flaky. If that
starts happening, then this should move into interactive-ui-test.

[Mark Dittmer, 2016/05/24 16:06:21]

Alright. I'll see how the bots feel about this when it lands.

+}
+
 }  // namespace views