[iOS] Upstream switches and flags controlling which WebView is used

ios/chrome/browser/web/web_view_type_util.h

Index: ios/chrome/browser/web/web_view_type_util.h
diff --git a/ios/chrome/browser/web/web_view_type_util.h b/ios/chrome/browser/web/web_view_type_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..5b0474b64107172ca8080753ea0bd15176dcd8a6
--- /dev/null
+++ b/ios/chrome/browser/web/web_view_type_util.h
@@ -0,0 +1,20 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_BROWSER_WEB_WEB_VIEW_TYPE_UTIL_H_
+#define IOS_CHROME_BROWSER_WEB_WEB_VIEW_TYPE_UTIL_H_
+
+#include "ios/web/public/web_view_type.h"
+
+// Utilities for getting the web view type to use in the application, or to
+// wrap web view creation APIs with versions that automatically select the
+// right type.
+namespace web_view_type_util {
+
+// Returns the type to use for all web views in the application.
+web::WebViewType GetWebViewType();
+
+}  // web_view_type_util
+
+#endif  // IOS_CHROME_BROWSER_WEB_WEB_VIEW_TYPE_UTIL_H_