Mark forwarded user gestures as forwarded, and don't forward already forwarded user gestures.

chrome/browser/extensions/extension_messages_apitest.cc

 // Copyright (c) 2012 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.
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 911 matching lines @@
           "});", receiver->id().c_str())));
 
   EXPECT_EQ("true",
       ExecuteScriptInBackgroundPage(sender->id(),
                                     base::StringPrintf(
           "chrome.test.runWithUserGesture(function() {\n"
           "  chrome.runtime.sendMessage('%s', {}, function(response)  {\n"
           "    window.domAutomationController.send('' + response.result);\n"
           "  });\n"
           "});", receiver->id().c_str())));
+
+  // Messges sent from a setTimeout handler should not forward the user gesture
+  // again.
+  EXPECT_EQ(
+      "false",
+      ExecuteScriptInBackgroundPage(
+          sender->id(),
+          base::StringPrintf(
+              "chrome.test.runWithUserGesture(function() {\n"
+              "  window.setTimeout(function() {\n"
+              "    chrome.runtime.sendMessage('%s', {}, function(response)  {\n"
+              "      window.domAutomationController.send('' + "
+              "          response.result);\n"
+              "    });\n"
+              "  }, 0);\n"
+              "});",
+              receiver->id().c_str())));
+
+  // The user gesture should not be send back with the reply message, gestures
+  // are only forwarded once.
+  EXPECT_EQ(
+      "false",
+      ExecuteScriptInBackgroundPage(
+          sender->id(),
+          base::StringPrintf(
+              "chrome.test.runWithUserGesture(function() {\n"
+              "  chrome.runtime.sendMessage('%s', {}, function(response)  {\n"
+              "    window.domAutomationController.send('' + "
+              "        chrome.test.isProcessingUserGesture());\n"
+              "  });\n"
+              "});",
+              receiver->id().c_str())));
 }
 
 // Tests that a hosted app on a connectable site doesn't interfere with the
 // connectability of that site.
 IN_PROC_BROWSER_TEST_F(ExternallyConnectableMessagingTest, HostedAppOnWebsite) {
   InitializeTestServer();
 
   LoadChromiumHostedApp();
 
   // The presence of the hosted app shouldn't give the ability to send messages.
@@ skipping 23 matching lines @@
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR ,
             CanConnectAndSendMessagesToMainFrame("invalid"));
 }
 
 #endif  // !defined(OS_WIN) - http://crbug.com/350517.
 
 }  // namespace
 
 };  // namespace extensions