Added arrow key navigation to Overview Mode

ui/views/controls/label.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/controls/label.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <vector>
@@ skipping 294 matching lines @@
   // Show the full text if the text does not fit.
   if (ShouldShowDefaultTooltip()) {
     *tooltip = layout_text();
     return true;
   }
 
   return false;
 }
 
 void Label::GetAccessibleState(ui::AXViewState* state) {
-  state->role = ui::AX_ROLE_STATIC_TEXT;
+  state->role = accessible_role_;
   state->AddStateFlag(ui::AX_STATE_READ_ONLY);
   state->name = layout_text();
 }
 
 void Label::PaintText(gfx::Canvas* canvas,
                       const base::string16& text,
                       const gfx::Rect& text_bounds,
                       int flags) {
   gfx::ShadowValues shadows;
   if (has_shadow_)
@@ skipping 50 matching lines @@
   CalculateDrawStringParams(&paint_text, &text_bounds, &flags);
   PaintText(canvas, paint_text, text_bounds, flags);
 }
 
 void Label::OnNativeThemeChanged(const ui::NativeTheme* theme) {
   UpdateColorsFromTheme(theme);
 }
 
 void Label::Init(const base::string16& text, const gfx::FontList& font_list) {
   font_list_ = font_list;
+  accessible_role_ = ui::AX_ROLE_STATIC_TEXT;
   enabled_color_set_ = disabled_color_set_ = background_color_set_ = false;
   auto_color_readability_ = true;
   UpdateColorsFromTheme(ui::NativeTheme::instance());
   horizontal_alignment_ = gfx::ALIGN_CENTER;
   line_height_ = 0;
   is_multi_line_ = false;
   is_obscured_ = false;
   allow_character_break_ = false;
   elide_behavior_ = ELIDE_AT_END;
   collapse_when_hidden_ = false;
@@ skipping 161 matching lines @@
     cached_heights_[i] = gfx::Size();
 }
 
 bool Label::ShouldShowDefaultTooltip() const {
   return !is_multi_line_ && !is_obscured_ &&
          gfx::GetStringWidth(layout_text(), font_list_) >
              GetAvailableRect().width();
 }
 
 }  // namespace views