Home shortcut should use touch icons when possible.

chrome/browser/ui/webui/ntp/android/bookmarks_handler.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/webui/ntp/android/bookmarks_handler.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 371 matching lines @@
       partner_bookmarks_shim_->GetNodeByID(id, is_partner);
   if (!node)
     return;
 
   FaviconService* favicon_service = FaviconServiceFactory::GetForProfile(
       profile, Profile::EXPLICIT_ACCESS);
   favicon_service->GetRawFaviconForURL(
       FaviconService::FaviconForURLParams(
           profile,
           node->url(),
-          history::FAVICON | history::TOUCH_ICON,
-          gfx::kFaviconSize),
-      ui::GetMaxScaleFactor(),
+          history::TOUCH_PRECOMPOSED_ICON | history::TOUCH_ICON |
+              history::FAVICON,
+          0),  // request the largest icon.
+      ui::SCALE_FACTOR_100P,  // density doesn't matter for the largest icon.
       base::Bind(&BookmarksHandler::OnShortcutFaviconDataAvailable,
                  base::Unretained(this),
                  node),
       &cancelable_task_tracker_);
 }
 
 void BookmarksHandler::OnShortcutFaviconDataAvailable(
     const BookmarkNode* node,
     const history::FaviconBitmapResult& bitmap_result) {
   SkColor color = SK_ColorWHITE;
   SkBitmap favicon_bitmap;
   if (bitmap_result.is_valid()) {
     color = GetDominantColorForFavicon(bitmap_result.bitmap_data);
     gfx::PNGCodec::Decode(bitmap_result.bitmap_data->front(),
                           bitmap_result.bitmap_data->size(),
                           &favicon_bitmap);
   }
   TabAndroid* tab = TabAndroid::FromWebContents(web_ui()->GetWebContents());
   if (tab) {
     tab->AddShortcutToBookmark(node->url(), node->GetTitle(),
                                favicon_bitmap, SkColorGetR(color),
                                SkColorGetG(color), SkColorGetB(color));
   }
 }