Add the feature to retain the user gesture in the extension callback

extensions/common/extension_messages.h

 // 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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
@@ skipping 278 matching lines @@
 
 }  // namespace IPC
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_MESSAGES_H_
 
 // Messages sent from the browser to the renderer.
 
 // The browser sends this message in response to all extension api calls. The
 // response data (if any) is one of the base::Value subclasses, wrapped as the
 // first element in a ListValue.
-IPC_MESSAGE_ROUTED4(ExtensionMsg_Response,
+IPC_MESSAGE_ROUTED5(ExtensionMsg_Response,
                     int /* request_id */,
                     bool /* success */,
                     base::ListValue /* response wrapper (see comment above) */,
-                    std::string /* error */)
+                    std::string /* error */,
+                    bool /* whether the response callback has user gesture */)
 
 // This message is optionally routed.  If used as a control message, it will
 // call a javascript function |function_name| from module |module_name| in
 // every registered context in the target process.  If routed, it will be
 // restricted to the contexts that are part of the target RenderView.
 //
 // If |extension_id| is non-empty, the function will be invoked only in
 // contexts owned by the extension. |args| is a list of primitive Value types
 // that are passed to the function.
 IPC_MESSAGE_ROUTED5(ExtensionMsg_MessageInvoke,
@@ skipping 311 matching lines @@
 // certain conditions.  This message is sent in response to several events:
 //
 // * ExtensionMsg_WatchPages was received, updating the set of conditions.
 // * A new page is loaded.  This will be sent after
 //   FrameHostMsg_DidCommitProvisionalLoad. Currently this only fires for the
 //   main frame.
 // * Something changed on an existing frame causing the set of matching searches
 //   to change.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_OnWatchedPageChange,
                     std::vector<std::string> /* Matching CSS selectors */)