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

chrome/browser/manifest/manifest_icon_selector.h

Index: chrome/browser/manifest/manifest_icon_selector.h
diff --git a/chrome/browser/manifest/manifest_icon_selector.h b/chrome/browser/manifest/manifest_icon_selector.h
index 8bad2144871d30cba2c6bfb0f064117bf6bee222..64014b203722185b8b390ba836f75bf56be2e114 100644
--- a/chrome/browser/manifest/manifest_icon_selector.h
+++ b/chrome/browser/manifest/manifest_icon_selector.h
@@ -33,13 +33,14 @@ class ManifestIconSelector {
   // 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,
       float preferred_icon_size_in_dp,
+      float minimum_icon_size_in_dp,
       const gfx::Screen* screen);
 
  private: