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

chrome/renderer/extensions/request_sender.cc

Index: chrome/renderer/extensions/request_sender.cc
===================================================================
--- chrome/renderer/extensions/request_sender.cc	(revision 263023)
+++ chrome/renderer/extensions/request_sender.cc	(working copy)
@@ -11,19 +11,24 @@
 #include "extensions/common/extension_messages.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebScopedUserGesture.h"
 #include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
+#include "third_party/WebKit/public/web/WebUserGestureToken.h"
 
 namespace extensions {
 
 // Contains info relevant to a pending API request.
 struct PendingRequest {
  public :
-  PendingRequest(const std::string& name, RequestSender::Source* source)
-      : name(name), source(source) {
+  PendingRequest(const std::string& name,
+                 RequestSender::Source* source,
+                 blink::WebUserGestureToken token)
+      : name(name), source(source), token(token) {
   }
 
   std::string name;
   RequestSender::Source* source;
+  blink::WebUserGestureToken token;
 };
 
 RequestSender::ScopedTabID::ScopedTabID(RequestSender* request_sender,
@@ -98,7 +103,8 @@
   if (blink::WebFrame* webframe = context->web_frame())
     source_url = webframe->document().url();
 
-  InsertRequest(request_id, new PendingRequest(name, source));
+  InsertRequest(request_id, new PendingRequest(name, source,
+      blink::WebUserGestureIndicator::currentUserGestureToken()));
 
   ExtensionHostMsg_Request_Params params;
   params.name = name;
@@ -122,7 +128,8 @@
 void RequestSender::HandleResponse(int request_id,
                                    bool success,
                                    const base::ListValue& response,
-                                   const std::string& error) {
+                                   const std::string& error,
+                                   bool user_gesture) {
   linked_ptr<PendingRequest> request = RemoveRequest(request_id);
 
   if (!request.get()) {
@@ -130,6 +137,10 @@
     return;
   }
 
+  scoped_ptr<blink::WebScopedUserGesture> gesture;
+  if (user_gesture)
+    gesture.reset(new blink::WebScopedUserGesture(request->token));
+
   request->source->OnResponseReceived(request->name, request_id, success,
                                       response, error);
 }