Factor Chrome details out of update manifest fetching.

chrome/browser/extensions/updater/extension_downloader.cc

Index: chrome/browser/extensions/updater/extension_downloader.cc
diff --git a/chrome/browser/extensions/updater/extension_downloader.cc b/chrome/browser/extensions/updater/extension_downloader.cc
index 58463804bf8bb59cd53896c90f08f51b61e769b3..1296662e225b9766d9fc1082bc65d892751b5655 100644
--- a/chrome/browser/extensions/updater/extension_downloader.cc
+++ b/chrome/browser/extensions/updater/extension_downloader.cc
@@ -187,7 +187,8 @@ ExtensionDownloader::ExtensionDownloader(
       extensions_queue_(&kDefaultBackoffPolicy,
                         base::Bind(&ExtensionDownloader::CreateExtensionFetcher,
                                    base::Unretained(this))),
-      extension_cache_(NULL) {
+      extension_cache_(NULL),
+      enable_extra_update_metrics_(false) {
   DCHECK(delegate_);
   DCHECK(request_context_);
 }
@@ -265,9 +266,8 @@ void ExtensionDownloader::StartBlacklistUpdate(
   // Note: it is very important that we use the https version of the update
   // url here to avoid DNS hijacking of the blacklist, which is not validated
   // by a public key signature like .crx files are.
-  scoped_ptr<ManifestFetchData> blacklist_fetch(
-      new ManifestFetchData(extension_urls::GetWebstoreUpdateUrl(),
-                            request_id));
+  scoped_ptr<ManifestFetchData> blacklist_fetch(CreateManifestFetchData(
+      extension_urls::GetWebstoreUpdateUrl(), request_id));
   DCHECK(blacklist_fetch->base_url().SchemeIsSecure());
   blacklist_fetch->AddExtension(kBlacklistAppID,
                                 version,
@@ -340,10 +340,10 @@ bool ExtensionDownloader::AddExtensionData(const std::string& id,
 
   std::vector<GURL> update_urls;
   update_urls.push_back(update_url);
-  // If UMA is enabled, also add to ManifestFetchData for the
+  // If metrics are enabled, also add to ManifestFetchData for the
   // webstore update URL.
   if (!extension_urls::IsWebstoreUpdateUrl(update_url) &&
-      ChromeMetricsServiceAccessor::IsMetricsReportingEnabled()) {
+      enable_extra_update_metrics_) {
     update_urls.push_back(extension_urls::GetWebstoreUpdateUrl());
   }
 
@@ -377,7 +377,7 @@ bool ExtensionDownloader::AddExtensionData(const std::string& id,
       // Otherwise add a new element to the list, if the list doesn't exist or
       // if its last element is already full.
       linked_ptr<ManifestFetchData> fetch(
-          new ManifestFetchData(update_urls[i], request_id));
+          CreateManifestFetchData(update_urls[i], request_id));
       fetches_preparing_[std::make_pair(request_id, update_urls[i])].
           push_back(fetch);
       added = fetch->AddExtension(id, version.GetString(),
@@ -928,4 +928,19 @@ void ExtensionDownloader::OnGetTokenFailure(
   extension_fetcher_->Start();
 }
 
+ManifestFetchData* ExtensionDownloader::CreateManifestFetchData(
+    const GURL& update_url,
+    int request_id) {
+  ManifestFetchData::PingMode ping_mode = ManifestFetchData::NO_PING;
+  if (update_url.DomainIs(ping_enabled_domain_.c_str())) {
+    if (enable_extra_update_metrics_) {
+      ping_mode = ManifestFetchData::PING_WITH_METRICS;
+    } else {
+      ping_mode = ManifestFetchData::PING;
+    }
+  }
+  return new ManifestFetchData(
+      update_url, request_id, brand_code_, manifest_query_params_, ping_mode);
+}
+
 }  // namespace extensions