Add chrome://site-tiles-internals/

chrome/common/url_constants.h

Index: chrome/common/url_constants.h
diff --git a/chrome/common/url_constants.h b/chrome/common/url_constants.h
index bc43563df9dbe35f0725da1b9721318d9dcb9d1d..258fb9515e6bc62150c8f25a8172d303bddcda28 100644
--- a/chrome/common/url_constants.h
+++ b/chrome/common/url_constants.h
@@ -64,6 +64,7 @@ extern const char kChromeUINaClURL[];
 extern const char kChromeUINetInternalsURL[];
 extern const char kChromeUINewProfileURL[];
 extern const char kChromeUINewTabURL[];
+extern const char kChromeUINTPTilesInternalsURL[];
 extern const char kChromeUIOmniboxURL[];
 extern const char kChromeUIPasswordManagerInternalsHost[];
 extern const char kChromeUIPluginsURL[];
@@ -206,6 +207,7 @@ extern const char kChromeUINaClHost[];
 extern const char kChromeUINetExportHost[];
 extern const char kChromeUINetInternalsHost[];
 extern const char kChromeUINewTabHost[];
+extern const char kChromeUINTPTilesInternalsHost[];
 extern const char kChromeUIOfflineInternalsHost[];
 extern const char kChromeUIOmniboxHost[];
 extern const char kChromeUIPluginsHost[];