Views:: Make Labels support text selection.

ui/views/controls/textfield/textfield.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 335 matching lines @@
   // View overrides:
   // Declared final since overriding by subclasses would interfere with the
   // accounting related to the scheduled text edit command. Subclasses should
   // use TextfieldController::HandleKeyEvent, to intercept the key event.
   bool OnKeyPressed(const ui::KeyEvent& event) final;
   bool OnKeyReleased(const ui::KeyEvent& event) final;
 
   // SelectionControllerDelegate overrides:
   gfx::RenderText* GetRenderTextForSelectionController() override;
   bool IsReadOnly() const override;
+  bool SupportsDrag() const override;
   void SetTextBeingDragged(bool value) override;
   int GetViewHeight() const override;
   int GetViewWidth() const override;
   int GetDragSelectionDelay() const override;
   void OnBeforePointerAction() override;
   void OnAfterPointerAction(bool text_changed, bool selection_changed) override;
   // Callers within Textfield should call UpdateAfterChange depending on the
   // return value.
   bool PasteSelectionClipboard() override;
   void UpdateSelectionClipboard() override;
@@ skipping 163 matching lines @@
 
   // Used to bind callback functions to this object.
   base::WeakPtrFactory<Textfield> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Textfield);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_