[ios Mojo] Supporting code for define WebUI function.

ios/web/test/test_url_constants.cc

Index: ios/web/test/test_url_constants.cc
diff --git a/ui/gl/gl_image.cc b/ios/web/test/test_url_constants.cc
similarity index 57%
copy from ui/gl/gl_image.cc
copy to ios/web/test/test_url_constants.cc
index b74aa83280aac15363d7da4828b83e84bbe6667c..e867552a56d50a9dd0784d5bd0c1fb363c13c70a 100644
--- a/ui/gl/gl_image.cc
+++ b/ios/web/test/test_url_constants.cc
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gl/gl_image.h"
+#include "ios/web/test/test_url_constants.h"
 
-namespace gl {
+namespace web {
 
-bool GLImage::EmulatingRGB() const {
-  return false;
-}
+const char kTestWebUIScheme[] = "testwebui";
 
-}  // namespace gl
+}  // namespace web