Added arrow key navigation to Overview Mode

ui/views/controls/label.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_LABEL_H_
 #define UI_VIEWS_CONTROLS_LABEL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 154 matching lines @@
   // |max_width| is the maximum width that will be used (longer lines will be
   // wrapped).  If 0, no maximum width is enforced.
   void SizeToFit(int max_width);
 
   // Gets/sets the flag to determine whether the label should be collapsed when
   // it's hidden (not visible). If this flag is true, the label will return a
   // preferred size of (0, 0) when it's not visible.
   void set_collapse_when_hidden(bool value) { collapse_when_hidden_ = value; }
   bool collapse_when_hidden() const { return collapse_when_hidden_; }
 
+  // Sets the accessibility role the label should report.
+  void set_accessible_role(ui::AXRole role) { accessible_role_ = role; }
+
   // Overridden from View:
   virtual gfx::Insets GetInsets() const OVERRIDE;
   virtual int GetBaseline() const OVERRIDE;
   // Overridden to compute the size required to display this label.
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
   // Returns the width of an ellipsis if the label is non-empty, or 0 otherwise.
   virtual gfx::Size GetMinimumSize() const OVERRIDE;
   // Returns the height necessary to display this label with the provided width.
   // This method is used to layout multi-line labels. It is equivalent to
   // GetPreferredSize().height() if the receiver is not multi-line.
@@ skipping 108 matching lines @@
   // Space between text and shadow.
   gfx::Point shadow_offset_;
 
   // Should a shadow be drawn behind the text?
   bool has_shadow_;
 
   // The cached heights to avoid recalculation in GetHeightForWidth().
   mutable std::vector<gfx::Size> cached_heights_;
   mutable int cached_heights_cursor_;
 
+  // A11y role for the label. Default is AX_ROLE_STATIC_TEXT.
+  ui::AXRole accessible_role_;
+
   DISALLOW_COPY_AND_ASSIGN(Label);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_LABEL_H_