Fix Jumplist favicons to have high resolution in HDPI Windows displays

ui/gfx/favicon_size.cc

 // 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.
 
 #include "ui/gfx/favicon_size.h"
 
 namespace gfx {
 
 const int kFaviconSize = 16;
 
+const int kHdpiFaviconSize = 32;

[sky, 2017/01/31 23:28:45]

This isn't entirely accurate. High dpi generally means any scale other than 1x.
Don't add this constant here.

[chengx, 2017/02/02 20:52:58]

Acknowledged.

+
 void CalculateFaviconTargetSize(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);
     }
   }
 }
 
 }  // namespace gfx