Make a pure mojo::View version of the aura::Window FocusController.

mojo/services/public/cpp/view_manager/lib/view.cc

Index: mojo/services/public/cpp/view_manager/lib/view.cc
diff --git a/mojo/services/public/cpp/view_manager/lib/view.cc b/mojo/services/public/cpp/view_manager/lib/view.cc
index 84a0455a9dfeab31aae0d1b27483a9ae21fb7e58..b371000ee798c25e46bd83667c09743b52a1dec6 100644
--- a/mojo/services/public/cpp/view_manager/lib/view.cc
+++ b/mojo/services/public/cpp/view_manager/lib/view.cc
@@ -311,6 +311,10 @@ void View::Reorder(View* relative, OrderDirection direction) {
 }
 
 bool View::Contains(View* child) const {
+  if (!child)
+    return false;
+  if (child == this)

[Elliot Glaysher, 2014/11/06 21:29:55]

This comes from aura: an aura window says it contains itself. It turns out that
this is needed in how the focus controller worked.

+    return true;
   if (manager_)
     CHECK_EQ(ViewPrivate(child).view_manager(), manager_);
   for (View* p = child->parent(); p; p = p->parent()) {