Implement NativeViewHostAura::InstallClip.

ui/views/controls/native/native_view_host_unittest.cc

Index: ui/views/controls/native/native_view_host_unittest.cc
diff --git a/ui/views/controls/native/native_view_host_unittest.cc b/ui/views/controls/native/native_view_host_unittest.cc
index 247782437a5022d0d45cc68ee4277789ca2b69b1..233ac7ae0382c7675400c0d207460eb2730bcc34 100644
--- a/ui/views/controls/native/native_view_host_unittest.cc
+++ b/ui/views/controls/native/native_view_host_unittest.cc
@@ -135,13 +135,25 @@ TEST_F(NativeViewHostTest, NativeViewHierarchyChanged) {
                                               test_view,
                                               host));
 
+#if defined(USE_AURA)
+  // One notification is generated from inserting the clipping window into the

[sky, 2014/06/05 15:49:01]

I think we can avoid this if you don't call Widget::ReparentView for the
clipping_window.

[calamity, 2014/06/06 08:13:45]

I made this change and it only works for some of these blocks. This one in
particular gets a notification from the native view getting reparented into the
clipping window.

Removed what I could.

+  // hierarchy.
+  EXPECT_EQ(1, test_view->notification_count());
+#else
   EXPECT_EQ(0, test_view->notification_count());
+#endif
   test_view->ResetCount();
 
   // Detaching should send a NativeViewHierarchyChanged() notification and
   // change the parent.
   host->Detach();
+#if defined(USE_AURA)
+  // The clipping window is removed on detach, so there is an extra hiearchy
+  // change.
+  EXPECT_EQ(2, test_view->notification_count());
+#else
   EXPECT_EQ(1, test_view->notification_count());
+#endif
   EXPECT_NE(toplevel()->GetNativeView(),
             GetNativeParent(child->GetNativeView()));
   test_view->ResetCount();
@@ -150,8 +162,15 @@ TEST_F(NativeViewHostTest, NativeViewHierarchyChanged) {
   // reset the parent.
   host->Attach(child->GetNativeView());
   EXPECT_EQ(1, test_view->notification_count());
+#if defined(USE_AURA)
+  // There is a clipping window inserted above the native view that needs to be
+  // accounted for when looking at the relationship between the native views..
+  EXPECT_EQ(toplevel()->GetNativeView(),
+            GetNativeParent(GetNativeParent(child->GetNativeView())));
+#else
   EXPECT_EQ(toplevel()->GetNativeView(),
             GetNativeParent(child->GetNativeView()));
+#endif
 }
 
 // Verifies ViewHierarchyChanged handles NativeViewHost remove, add and move