text input focus: Supports Window::GetFocusedTextInputClient.

ui/views/widget/widget.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/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 421 matching lines @@
   // the root_view_ being removed.
   if (focus_manager)
     focus_manager->ViewRemoved(root_view_.get());
 }
 
 void Widget::NotifyNativeViewHierarchyChanged() {
   root_view_->NotifyNativeViewHierarchyChanged();
 }
 
 void Widget::NotifyWillRemoveView(View* view) {
-    FOR_EACH_OBSERVER(WidgetRemovalsObserver,
-                      removals_observers_,
-                      OnWillRemoveView(this, view));
+  FOR_EACH_OBSERVER(WidgetRemovalsObserver,
+                    removals_observers_,
+                    OnWillRemoveView(this, view));
 }
 
 // Converted methods (see header) ----------------------------------------------
 
 Widget* Widget::GetTopLevelWidget() {
   return const_cast<Widget*>(
       static_cast<const Widget*>(this)->GetTopLevelWidget());
 }
 
 const Widget* Widget::GetTopLevelWidget() const {
@@ skipping 294 matching lines @@
 FocusManager* Widget::GetFocusManager() {
   Widget* toplevel_widget = GetTopLevelWidget();
   return toplevel_widget ? toplevel_widget->focus_manager_.get() : NULL;
 }
 
 const FocusManager* Widget::GetFocusManager() const {
   const Widget* toplevel_widget = GetTopLevelWidget();
   return toplevel_widget ? toplevel_widget->focus_manager_.get() : NULL;
 }
 
+ui::TextInputClient* Widget::GetFocusedTextInputClient() {
+  FocusManager* focus_manager = GetFocusManager();
+  View* view = focus_manager ? focus_manager->GetFocusedView() : nullptr;
+  return view ? view->GetTextInputClient() : nullptr;
+}
+
 InputMethod* Widget::GetInputMethod() {
   return const_cast<InputMethod*>(
       const_cast<const Widget*>(this)->GetInputMethod());
 }
 
 const InputMethod* Widget::GetInputMethod() const {
   if (is_top_level()) {
     if (!input_method_.get())
       input_method_ = const_cast<Widget*>(this)->CreateInputMethod().Pass();
     return input_method_.get();
@@ skipping 759 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views