webapps: allow callers of icon downloader/selector to specify a minimum size

chrome/browser/manifest/manifest_icon_selector.h

 // Copyright 2015 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 CHROME_BROWSER_MANIFEST_MANIFEST_ICON_SELECTOR_H_
 #define CHROME_BROWSER_MANIFEST_MANIFEST_ICON_SELECTOR_H_
 
 #include "base/basictypes.h"
 #include "content/public/common/manifest.h"
 #include "url/gurl.h"
@@ skipping 15 matching lines @@
 class ManifestIconSelector {
  public:
   // Runs the algorithm to find the best matching icon in the icons listed in
   // the Manifest.
   //
   // Size is defined in Android's density-independent pixels (dp):
   // http://developer.android.com/guide/practices/screens_support.html
   // If/when this class is generalized, it may be a good idea to switch this to
   // taking in pixels, instead.
   //
-  // The icon returned will have a minimum size of an image one density bucket
-  // smaller than the device denisity * preferred_icon_size_in_dp.
+  // Any icon returned will have a minimum size as specified by
+  // |minimum_icon_size_in_dp|.
   //
   // Returns the icon url if a suitable icon is found. An empty URL otherwise.
   static GURL FindBestMatchingIcon(
       const std::vector<content::Manifest::Icon>& icons,
       int ideal_icon_size_in_dp,
+      int minimum_icon_size_in_dp,
       const gfx::Screen* screen);
 
  private:
   ManifestIconSelector(int ideal_icon_size_in_px,
                        int minimum_icon_size_in_px);
   virtual ~ManifestIconSelector() {}
 
   // Runs the algorithm to find the best matching icon in the icons listed in
   // the Manifest.
   // Returns the icon url if a suitable icon is found. An empty URL otherwise.
@@ skipping 27 matching lines @@
 
   const int ideal_icon_size_in_px_;
   const int minimum_icon_size_in_px_;
 
   friend class ManifestIconSelectorTest;
 
   DISALLOW_COPY_AND_ASSIGN(ManifestIconSelector);
 };
 
 #endif  // CHROME_BROWSER_MANIFEST_MANIFEST_ICON_SELECTOR_H_