Upstream JavaScript injection for iOS

ios/web/web_view_util.h

Index: ios/web/web_view_util.h
diff --git a/ios/web/web_view_util.h b/ios/web/web_view_util.h
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+// Copyright 2014 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_WEB_WEB_VIEW_UTIL_H_
+#define IOS_WEB_WEB_VIEW_UTIL_H_
+
+namespace web {
+
+// Returns true if WKWebView is being used instead of UIWebView.
+bool IsWKWebViewEnabled();
+
+// If |flag| is true, causes IsWKWebViewEnabled to return false, even if
+// WKWebView is enabled using the compile time flag. Should only be called from
+// ScopedUIWebViewEnforcer for use in unit tests that need to test UIWebView
+// while WKWebView is enabled.
+void SetForceUIWebView(bool flag);
+
+// Returns true if use of UIWebView is to be enforced.
+bool GetForceUIWebView();
+
+}  // web
+
+#endif  // IOS_WEB_WEB_VIEW_UTIL_H_