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

chrome/browser/banners/app_banner_data_fetcher.cc

 // 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.
 
 #include "chrome/browser/banners/app_banner_data_fetcher.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/banners/app_banner_debug_log.h"
 #include "chrome/browser/banners/app_banner_metrics.h"
 #include "chrome/browser/banners/app_banner_settings_helper.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/manifest/manifest_icon_downloader.h"
 #include "chrome/browser/manifest/manifest_icon_selector.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 323 matching lines @@
   }
 
   OnHasServiceWorker(web_contents);
 }
 
 void AppBannerDataFetcher::OnHasServiceWorker(
     content::WebContents* web_contents) {
   GURL icon_url = ManifestIconSelector::FindBestMatchingIcon(
       web_app_data_.icons, ideal_icon_size_in_dp_, minimum_icon_size_in_dp_);
 
-  if (!FetchAppIcon(web_contents, icon_url)) {
-    OutputDeveloperNotShownMessage(web_contents, kCannotDetermineBestIcon,
+  if (icon_url.is_empty()) {
+    OutputDeveloperNotShownMessage(
+        web_contents,
+        base::IntToString(ManifestIconSelector::ConvertIconSizeFromDpToPx(
+            minimum_icon_size_in_dp_)) +
+            kNoIconMatchingRequirements,
+        is_debug_mode_);
+    Cancel();
+  } else if (!FetchAppIcon(web_contents, icon_url)) {
+    OutputDeveloperNotShownMessage(web_contents, kCannotDownloadIcon,
                                    is_debug_mode_);
     Cancel();
   }
 }
 
 bool AppBannerDataFetcher::FetchAppIcon(content::WebContents* web_contents,
                                         const GURL& icon_url) {
   return ManifestIconDownloader::Download(
       web_contents,
       icon_url,
@@ skipping 92 matching lines @@
   }
   if (!DoesManifestContainRequiredIcon(manifest)) {
     OutputDeveloperNotShownMessage(web_contents, kManifestMissingSuitableIcon,
                                    is_debug_mode);
     return false;
   }
   return true;
 }
 
 }  // namespace banners