Improve large tab strip by leveraging touch icons when present

ui/gfx/favicon_size.h

 // Copyright (c) 2011 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_GFX_FAVICON_SIZE_H_
 #define UI_GFX_FAVICON_SIZE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 
 // Size (along each axis) of the favicon.
-#if defined(TOUCH_UI)
-const int kFaviconSize = 32;
-#else
 const int kFaviconSize = 16;
-#endif
+
+// The size of the favicon touch area.
+const int kTouchTargetIconSize = 32;
 
 // If the width or height is bigger than the favicon size, a new width/height
 // is calculated and returned in width/height that maintains the aspect
 // ratio of the supplied values.
 static void calc_favicon_target_size(int* width, int* height) ALLOW_UNUSED;
 
 // static
 void calc_favicon_target_size(int* width, int* height) {
   if (*width > kFaviconSize || *height > kFaviconSize) {
     // Too big, resize it maintaining the aspect ratio.
     float aspect_ratio = static_cast<float>(*width) /
                          static_cast<float>(*height);
     *height = kFaviconSize;
     *width = static_cast<int>(aspect_ratio * *height);
     if (*width > kFaviconSize) {
       *width = kFaviconSize;
       *height = static_cast<int>(*width / aspect_ratio);
     }
   }
 }
 
 #endif  // UI_GFX_FAVICON_SIZE_H_