Use high resolution icons where possible for streamlined hosted app icons.

ui/gfx/image/image_family.h

 // Copyright 2013 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_IMAGE_IMAGE_FAMILY_H_
 #define UI_GFX_IMAGE_IMAGE_FAMILY_H_
 
 #include <iterator>
 #include <map>
 #include <utility>
@@ skipping 88 matching lines @@
   ~ImageFamily();
 
   // Gets an iterator to the first image.
   const_iterator begin() const { return const_iterator(map_.begin()); }
   // Gets an iterator to one after the last image.
   const_iterator end() const { return const_iterator(map_.end()); }
 
   // Determines whether the image family has no images in it.
   bool empty() const { return map_.empty(); }
 
+  // Returns the number of images in the family.
+  size_t size() const { return map_.size(); }
+
   // Removes all images from the family.
   void clear() { return map_.clear(); }
 
   // Adds an image to the family. If another image is already present at the
   // same size, it will be overwritten.
   void Add(const gfx::Image& image);
 
   // Adds an image to the family. If another image is already present at the
   // same size, it will be overwritten.
   void Add(const gfx::ImageSkia& image_skia);
@@ skipping 28 matching lines @@
   // |map_| of aspect ratio |aspect|.
   const gfx::Image* GetWithExactAspect(float aspect, int width) const;
 
   // Map from (aspect ratio, width) to image.
   std::map<MapKey, gfx::Image> map_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_FAMILY_H_