Add UMA histograms for Google cached copy experiment on network error interstitial

components/error_page/renderer/net_error_helper_core_unittest.cc

Index: components/error_page/renderer/net_error_helper_core_unittest.cc
diff --git a/components/error_page/renderer/net_error_helper_core_unittest.cc b/components/error_page/renderer/net_error_helper_core_unittest.cc
index 005c5c21b9379025fd212db646cdd1eccc9f5bfa..1284def6d7af9a6818e7970f0fcb30f979b34b18 100644
--- a/components/error_page/renderer/net_error_helper_core_unittest.cc
+++ b/components/error_page/renderer/net_error_helper_core_unittest.cc
@@ -311,10 +311,14 @@ class NetErrorHelperCoreTest : public testing::Test,
                                   scoped_ptr<ErrorPageParams> params,
                                   bool* reload_button_shown,
                                   bool* show_saved_copy_button_shown,
+                                  bool* show_cached_copy_button_shown,
+                                  bool* show_cached_page_button_shown,
                                   std::string* html) const override {
     last_error_page_params_.reset(params.release());
     *reload_button_shown = false;
     *show_saved_copy_button_shown = false;
+    *show_cached_copy_button_shown = false;
+    *show_cached_page_button_shown = false;
     *html = ErrorToString(error, is_failed_post);
   }