Add string localization test mode

webkit/support/test_webkit_platform_support.cc

Index: webkit/support/test_webkit_platform_support.cc
diff --git a/webkit/support/test_webkit_platform_support.cc b/webkit/support/test_webkit_platform_support.cc
index 6fd34f32dd14dd9a66de29fd0c211b43c49bd9e4..74bc2376e9499bc496fa9b12b63b2dddad4fe4c9 100644
--- a/webkit/support/test_webkit_platform_support.cc
+++ b/webkit/support/test_webkit_platform_support.cc
@@ -9,6 +9,7 @@
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/string_util.h"
+#include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "media/base/media.h"
 #include "net/cookies/cookie_monster.h"
@@ -266,6 +267,8 @@ WebKit::WebData TestWebKitPlatformSupport::loadResource(const char* name) {
 
 WebKit::WebString TestWebKitPlatformSupport::queryLocalizedString(
     WebKit::WebLocalizedString::Name name) {
+  if (WebKit::WebRuntimeFeatures::isStringLocalizationTestModeEnabled())
+    return base::IntToString16(name);
   // Returns messages same as WebKit's in DRT.
   // We use different strings for form validation messages.
   switch (name) {