Update component updater URLs.

components/component_updater/configurator_impl.cc

Index: components/component_updater/configurator_impl.cc
diff --git a/components/component_updater/configurator_impl.cc b/components/component_updater/configurator_impl.cc
index 1da87add716765eaa3a4104ea808b6ae15c37246..db6790696ebc88acf59d85f86d0751827243071e 100644
--- a/components/component_updater/configurator_impl.cc
+++ b/components/component_updater/configurator_impl.cc
@@ -9,6 +9,7 @@
 #include <algorithm>
 
 #include "base/command_line.h"
+#include "base/feature_list.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/version.h"
@@ -54,6 +55,9 @@ const char kSwitchDisableDeltaUpdates[] = "disable-delta-updates";
 const char kSwitchDisableBackgroundDownloads[] = "disable-background-downloads";
 #endif  // defined(OS_WIN)
 
+const base::Feature kAlternateComponentUrls{"AlternateComponentUrls",
+                                            base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Returns true if and only if |test| is contained in |vec|.
 bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   if (vec.empty())
@@ -148,8 +152,14 @@ std::vector<GURL> ConfiguratorImpl::UpdateUrl() const {
     return urls;
   }
 
-  urls.push_back(GURL(kUpdaterDefaultUrl));
-  urls.push_back(GURL(kUpdaterFallbackUrl));
+  if (base::FeatureList::IsEnabled(kAlternateComponentUrls)) {
+    urls.push_back(GURL(kUpdaterDefaultUrlAlt));
+    urls.push_back(GURL(kUpdaterFallbackUrlAlt));
+  } else {
+    urls.push_back(GURL(kUpdaterDefaultUrl));
+    urls.push_back(GURL(kUpdaterFallbackUrl));
+  }
+
   if (require_encryption_)
     update_client::RemoveUnsecureUrls(&urls);