aura: Updates the text input client when native activation changes.

ui/views/focus/focus_manager.cc

Index: ui/views/focus/focus_manager.cc
diff --git a/ui/views/focus/focus_manager.cc b/ui/views/focus/focus_manager.cc
index b4bbd17cba9081be0fea01481b4bb9e41b0d2bdc..3a6bba730b544c482a522eaddb6a1b914a30db5d 100644
--- a/ui/views/focus/focus_manager.cc
+++ b/ui/views/focus/focus_manager.cc
@@ -313,8 +313,12 @@ View* FocusManager::GetNextFocusableView(View* original_starting_view,
 
 void FocusManager::SetFocusedViewWithReason(
     View* view, FocusChangeReason reason) {
-  if (focused_view_ == view)
+  if (focused_view_ == view) {
+    // In the case that the widget lost the focus and gained it back without
+    // changing the focused view, we have to make the text input client focused.
+    FocusTextInputClient(focused_view_);

[sky, 2014/05/27 17:05:44]

We also can end up here if View::RequestFocus() is invoked and the view already
has focus. Does anything bad happen in that case?

[Yuki, 2014/05/28 15:02:43]

No, nothing bad happen.

If the widget is active, |focused_view_->GetTextInputClient()| must already be
set and the same text input client is going to be set again.  It's actually
no-op.

If the widget is not active, we do nothing.

     return;
+  }
 
   base::AutoReset<bool> auto_changing_focus(&is_changing_focus_, true);
   // Update the reason for the focus change (since this is checked by