aura: Updates the text input client when native activation 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 107445f7b2c46c601cf46f79d0ce877016cc23c7..d549616d7231aa57ca15552591cfa1bb2c1802c4 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -1015,6 +1015,19 @@ void Widget::OnNativeWidgetActivationChanged(bool active) {
   FOR_EACH_OBSERVER(WidgetObserver, observers_,
                     OnWidgetActivationChanged(this, active));
 
+  // During window creation, the widget gets focused without activation, and in
+  // that case, the focus manager cannot set the appropriate text input client
+  // because the widget is not active.  Thus we have to notify the focus manager
+  // not only when the focus changes but also when the widget gets activated.
+  // See crbug.com/377479 for details.
+  views::FocusManager* focus_manager = GetFocusManager();
+  if (focus_manager) {
+    if (active)
+      focus_manager->FocusTextInputClient(focus_manager->GetFocusedView());
+    else
+      focus_manager->BlurTextInputClient(focus_manager->GetFocusedView());
+  }
+
   if (IsVisible() && non_client_view())
     non_client_view()->frame_view()->SchedulePaint();
 }