Added arrow key navigation to Overview Mode

ui/views/controls/label.h

Index: ui/views/controls/label.h
diff --git a/ui/views/controls/label.h b/ui/views/controls/label.h
index 45f01988018f59bb311a3fa425be0ceb35fb272c..feca3fd18a1e7ab3563462ae22fea87e6b03be5a 100644
--- a/ui/views/controls/label.h
+++ b/ui/views/controls/label.h
@@ -172,6 +172,9 @@ class VIEWS_EXPORT Label : public View {
   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;
@@ -300,6 +303,9 @@ class VIEWS_EXPORT Label : public View {
   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);
 };