Modified tab change to work with status tray change

chrome/browser/ui/views/tabs/tab.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 "chrome/browser/ui/views/tabs/tab.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 445 matching lines @@
                           rb.GetImageSkiaNamed(IDR_CLOSE_1_H));
   close_button_->SetImage(views::CustomButton::STATE_PRESSED,
                           rb.GetImageSkiaNamed(IDR_CLOSE_1_P));
   close_button_->SetAccessibleName(
       l10n_util::GetStringUTF16(IDS_ACCNAME_CLOSE));
   // Disable animation so that the red danger sign shows up immediately
   // to help avoid mis-clicks.
   close_button_->SetAnimationDuration(0);
   AddChildView(close_button_);
 
+  SetAccessibilityFocusable(true);

[sky, 2014/07/25 03:19:30]

Tabs aren't set up to be focusable. I'm not opposed to doing this, but it isn't
as simple as just flipping this bit.

+
   set_context_menu_controller(this);
 }
 
 Tab::~Tab() {
 }
 
 void Tab::set_animation_container(gfx::AnimationContainer* container) {
   animation_container_ = container;
   hover_controller_.SetAnimationContainer(container);
 }
@@ skipping 1176 matching lines @@
                          const gfx::ImageSkia& image) {
   DCHECK_NE(scale_factor, ui::SCALE_FACTOR_NONE);
   ImageCacheEntry entry;
   entry.resource_id = resource_id;
   entry.scale_factor = scale_factor;
   entry.image = image;
   image_cache_->push_front(entry);
   if (image_cache_->size() > kMaxImageCacheSize)
     image_cache_->pop_back();
 }