Upstream JavaScript injection for iOS

ios/web/web_state/js/crw_js_common_manager.h

Index: ios/web/web_state/js/crw_js_common_manager.h
diff --git a/ios/web/web_state/js/crw_js_common_manager.h b/ios/web/web_state/js/crw_js_common_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..4b147719bdc214ca1dfd25ea137b9bae1009189f
--- /dev/null
+++ b/ios/web/web_state/js/crw_js_common_manager.h
@@ -0,0 +1,17 @@
+// Copyright 2013 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_STATE_JS_CRW_JS_COMMON_MANAGER_H_
+#define IOS_WEB_WEB_STATE_JS_CRW_JS_COMMON_MANAGER_H_
+
+#import "ios/web/public/web_state/js/crw_js_injection_manager.h"
+
+@class CRWJSInjectionReceiver;
+
+// Loads JavaScript file common.js which contains common JavaScript methods that
+// can be called by other CRWJSInjectionManagers.
+@interface CRWJSCommonManager : CRWJSInjectionManager
+@end
+
+#endif  // IOS_WEB_WEB_STATE_JS_CRW_JS_COMMON_MANAGER_H_