Reorder the NativeViews attached to a view via kViewHostKey according to the position of the view

ui/views/controls/native/native_view_host_aura_unittest.cc

Index: ui/views/controls/native/native_view_host_aura_unittest.cc
diff --git a/ui/views/controls/native/native_view_host_aura_unittest.cc b/ui/views/controls/native/native_view_host_aura_unittest.cc
index 30999326b66c86481def586954968ed2ade624b7..7653cc905c31ba106fc6e6d4b920b754f9a4289b 100644
--- a/ui/views/controls/native/native_view_host_aura_unittest.cc
+++ b/ui/views/controls/native/native_view_host_aura_unittest.cc
@@ -10,6 +10,7 @@
 #include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/view.h"
+#include "ui/views/view_constants_aura.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
@@ -23,6 +24,10 @@ class NativeViewHostAuraTest : public ViewsTestBase {
     return static_cast<NativeViewHostAura*>(host_->native_wrapper_.get());
   }
 
+  NativeViewHost* host() {
+    return host_.get();
+  }
+
   Widget* child() {
     return child_.get();
   }
@@ -73,4 +78,21 @@ TEST_F(NativeViewHostAuraTest, StopObservingNativeViewOnDestruct) {
   EXPECT_FALSE(child_win->HasObserver(aura_host));
 }
 
+// Tests that the kHostViewKey is correctly set and cleared.
+TEST_F(NativeViewHostAuraTest, HostViewPropertyKey) {
+  // Create the NativeViewHost and attach a NativeView.
+  CreateHost();
+  aura::Window* child_win = child()->GetNativeView();
+  EXPECT_EQ(host(), child_win->GetProperty(views::kHostViewKey));
+
+  host()->Detach();
+  EXPECT_FALSE(child_win->GetProperty(views::kHostViewKey));
+
+  host()->Attach(child_win);
+  EXPECT_EQ(host(), child_win->GetProperty(views::kHostViewKey));
+
+  DestroyHost();
+  EXPECT_FALSE(child_win->GetProperty(views::kHostViewKey));
+}
+
 }  // namespace views