a11y: Add a11y information to views::Tab and manually ignore its a11y children.

ui/views/controls/tabbed_pane/tabbed_pane.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_TABBED_PANE_TABBED_PANE_H_
 #define UI_VIEWS_CONTROLS_TABBED_PANE_TABBED_PANE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ skipping 103 matching lines @@
   bool selected() const { return contents_->visible(); }
   void SetSelected(bool selected);
 
   // Overridden from View:
   bool OnMousePressed(const ui::MouseEvent& event) override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
   gfx::Size GetPreferredSize() const override;
   const char* GetClassName() const override;
+  void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
   void OnFocus() override;
   void OnBlur() override;
   bool OnKeyPressed(const ui::KeyEvent& event) override;
 
  protected:
   Label* title() { return title_; }
 
   // Called whenever |tab_state_| changes.
   virtual void OnStateChanged();
 
@@ skipping 12 matching lines @@
   TabState tab_state_;
   // The content view associated with this tab.
   View* contents_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TABBED_PANE_TABBED_PANE_H_