Update Windows UI on system color changes.

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index a01f90a3e547e1ae978c76656c853a0c864e572b..ba3723d0b3ec966d07faa9bdaf9f6639ec25bc69 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -183,7 +183,8 @@ Widget::Widget()
       last_mouse_event_was_move_(false),
       auto_release_capture_(true),
       root_layers_dirty_(false),
-      movement_disabled_(false) {
+      movement_disabled_(false),
+      observer_manager_(this) {
 }
 
 Widget::~Widget() {
@@ -368,6 +369,7 @@ void Widget::Init(const InitParams& in_params) {
         internal::NativeWidgetPrivate::IsMouseButtonDown();
   }
   native_widget_->InitNativeWidget(params);
+  observer_manager_.Add(GetNativeTheme());
   if (RequiresNonClientView(params.type)) {
     non_client_view_ = new NonClientView;
     non_client_view_->SetFrameView(CreateNonClientFrameView());
@@ -1339,6 +1341,13 @@ View* Widget::GetFocusTraversableParentView() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// Widget, ui::NativeThemeObserver implementation:
+
+void Widget::OnNativeThemeUpdate() {

[Evan Stade, 2014/04/24 01:14:52]

I still think this should pass the calling native theme. For now you could
DCHECK_EQ(theme, GetNativeTheme()).

[msw, 2014/04/24 18:32:00]

Done; this is a good idea, thanks for pushing for it.

+  root_view_->PropagateNativeThemeChanged(GetNativeTheme());
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // Widget, protected:
 
 internal::RootView* Widget::CreateRootView() {