Create chrome://offline URL

ios/chrome/browser/chrome_url_constants.h

Index: ios/chrome/browser/chrome_url_constants.h
diff --git a/ios/chrome/browser/chrome_url_constants.h b/ios/chrome/browser/chrome_url_constants.h
index b678cbd0f3bd2820133e2f97f427043da94a8235..0777561a1a888509fbfd22b2ec91a9f4c34b4585 100644
--- a/ios/chrome/browser/chrome_url_constants.h
+++ b/ios/chrome/browser/chrome_url_constants.h
@@ -27,6 +27,7 @@ extern const char kChromeUICreditsURL[];
 extern const char kChromeUIFlagsURL[];
 extern const char kChromeUIHistoryURL[];
 extern const char kChromeUINewTabURL[];
+extern const char kChromeUIOfflineURL[];
 extern const char kChromeUIPhysicalWebURL[];
 extern const char kChromeUIPopularSitesInternalsURL[];
 extern const char kChromeUISettingsURL[];
@@ -48,6 +49,7 @@ extern const char kChromeUIHistoryFrameHost[];
 extern const char kChromeUIHistoryHost[];
 extern const char kChromeUINetExportHost[];
 extern const char kChromeUINewTabHost[];
+extern const char kChromeUIOfflineHost[];
 extern const char kChromeUIOmahaHost[];
 extern const char kChromeUIPhysicalWebHost[];
 extern const char kChromeUIPopularSitesInternalsHost[];