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

ui/views/focus/focus_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/focus/focus_manager.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/auto_reset.h"
@@ skipping 295 matching lines @@
       if (widget->widget_delegate()->ShouldAdvanceFocusToTopLevelWidget())
         widget = widget_;
       return GetNextFocusableView(NULL, widget, reverse, true);
     }
   }
   return NULL;
 }
 
 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
   // some listeners), then notify all listeners.
   focus_change_reason_ = reason;
   FOR_EACH_OBSERVER(FocusChangeListener, focus_change_listeners_,
                     OnWillChangeFocus(focused_view_, view));
 
   View* old_focused_view = focused_view_;
   focused_view_ = view;
@@ skipping 251 matching lines @@
   }
   if (key_code == ui::VKEY_RIGHT || key_code == ui::VKEY_DOWN) {
     AdvanceFocus(false);
     return true;
   }
 
   return false;
 }
 
 }  // namespace views