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 54ccdbab988fd72e21a94d9362f03531d3a2e28f..a2b5c24d5d8963a79410cfccaf569da4ec76151f 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 be close as possible to |ideal_icon_size_in_dp|
+  // with a size not less than |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: