Neterror interstitials: Add switch for upcoming experiment

Change-Id: I3f76e2ec46f199c1ce905f5a52de66ea67a23459
Reviewed-on: https://chromium-review.googlesource.com/1071516Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Edward Jung <edwardjung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561541}

chrome/browser/chrome_content_browser_client.cc

@@ -1843,6 +1843,7 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
 
   static const char* const kDinosaurEasterEggSwitches[] = {
       error_page::switches::kDisableDinosaurEasterEgg,
+      error_page::switches::kEnableEasterEggBdayMode,
   };
   command_line->CopySwitchesFrom(browser_command_line,
                                  kDinosaurEasterEggSwitches,

components/error_page/common/error_page_switches.cc

@@ -9,6 +9,7 @@ namespace switches {
 
 // Disables the dinosaur easter egg on the offline interstitial.
 const char kDisableDinosaurEasterEgg[] = "disable-dinosaur-easter-egg";
+const char kEnableEasterEggBdayMode[] = "enable-dino-easter-egg-bday-mode";
 
 // Values for the kShowSavedCopy flag.
 const char kDisableShowSavedCopy[] = "disable";

components/error_page/common/error_page_switches.h

@@ -12,6 +12,7 @@ namespace switches {
 
 extern const char kDisableDinosaurEasterEgg[];
 extern const char kDisableShowSavedCopy[];
+extern const char kEnableEasterEggBdayMode[];
 extern const char kEnableShowSavedCopyPrimary[];
 extern const char kEnableShowSavedCopySecondary[];
 extern const char kShowSavedCopy[];

components/error_page/common/localized_error.cc

@@ -938,6 +938,12 @@ void LocalizedError::GetStrings(
         l10n_util::GetStringUTF16(IDS_ERRORPAGE_FUN_DISABLED));
   }
 
+  if (command_line->HasSwitch(error_page::switches::kEnableEasterEggBdayMode) ||
+      base::FieldTrialList::FindFullName("EnableEasterEggBdayMode") ==
+          "enabled") {
+    error_strings->SetBoolean("bdayMode", true);
+  }
+
   summary->SetString("failedUrl", failed_url_string);
   summary->SetString("hostName", host_name);