Log the expected icon size when no suitable icon for a banner is found.

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 da2b7f6571292fb79dd7bfcb9a2474ac9b5bb13b..9d9736d6bd7fe12258f4cb3ba09076ed72fd0fb5 100644
--- a/chrome/browser/manifest/manifest_icon_selector.h
+++ b/chrome/browser/manifest/manifest_icon_selector.h
@@ -42,6 +42,8 @@ class ManifestIconSelector {
       int ideal_icon_size_in_dp,
       int minimum_icon_size_in_dp);
 
+  static int ConvertIconSizeFromDpToPx(int icon_size_in_dp);
+
  private:
   ManifestIconSelector(int ideal_icon_size_in_px,
                        int minimum_icon_size_in_px);
@@ -50,9 +52,7 @@ class 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.
-  int FindBestMatchingIcon(
-      const std::vector<content::Manifest::Icon>& icons,
-      float density);
+  int FindBestMatchingIcon(const std::vector<content::Manifest::Icon>& icons);
 
   // Runs an algorithm only based on icon declared sizes. It will try to find
   // size that is the closest to preferred_icon_size_in_pixels_ but bigger than
@@ -80,6 +80,7 @@ class ManifestIconSelector {
 
   const int ideal_icon_size_in_px_;
   const int minimum_icon_size_in_px_;
+  const float density_;
 
   friend class ManifestIconSelectorTest;