Plumb listenerIDs correctly for events that clobber chrome.Event.prototype.dispatch.

chrome/renderer/resources/extensions/experimental.app_custom_bindings.js

 // 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.
 
 // Custom bindings for the experimental.app API.
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var fileSystemHelpers = requireNative('file_system_natives');
 var GetIsolatedFileSystem = fileSystemHelpers.GetIsolatedFileSystem;
 var appNatives = requireNative('experimental_app');
 var DeserializeString = appNatives.DeserializeString;
 var CreateBlob = appNatives.CreateBlob;
 
-chromeHidden.registerCustomHook('experimental.app', function(bindingsAPI) {
-  chrome.experimental.app.onLaunched.dispatch =
-      function(launchData, intentData) {
-    if (launchData && intentData) {
-      switch(intentData.format) {
-        case('fileEntry'):
-          var event = this;
-          var fs = GetIsolatedFileSystem(intentData.fileSystemId);
-          try {
-            fs.root.getFile(intentData.baseName, {}, function(fileEntry) {
-              launchData.intent.data = fileEntry;
-              launchData.intent.postResult = function() {};
-              launchData.intent.postFailure = function() {};
-              chrome.Event.prototype.dispatch.call(event, launchData);
-            }, function(fileError) {
-              console.error('Error getting fileEntry, code: ' + fileError.code);
-              chrome.Event.prototype.dispatch.call(event);
-            });
-          } catch (e) {
-            console.error('Error in event handler for onLaunched: ' + e.stack);
-            chrome.Event.prototype.dispatch.call(event);
-          }
-          break;
-        case('serialized'):
-          var deserializedData = DeserializeString(intentData.data);
-          launchData.intent.data = deserializedData;
-          launchData.intent.postResult = function() {};
-          launchData.intent.postFailure = function() {};
-          chrome.Event.prototype.dispatch.call(this, launchData);
-          break;
-        case('blob'):
-          var blobData = CreateBlob(intentData.blobFilePath,
-                                    intentData.blobLength);
-          launchData.intent.data = blobData;
-          launchData.intent.postResult = function() {};
-          launchData.intent.postFailure = function() {};
-          chrome.Event.prototype.dispatch.call(this, launchData);
-          break;
-        default:
-          console.error('Unexpected launch data format');
-          chrome.Event.prototype.dispatch.call(this);
-      }
-    } else if (launchData) {
-      chrome.Event.prototype.dispatch.call(this, launchData);
-    } else {
-      chrome.Event.prototype.dispatch.call(this);
+chromeHidden.Event.registerArgumentMassager('experimental.app.onLaunched',
+    function(args, dispatch) {
+  var launchData = args[0];
+  var intentData = args[1];
+
+  if (launchData && intentData) {
+    switch(intentData.format) {
+      case('fileEntry'):
+        var fs = GetIsolatedFileSystem(intentData.fileSystemId);
+        try {
+          fs.root.getFile(intentData.baseName, {}, function(fileEntry) {
+            launchData.intent.data = fileEntry;
+            launchData.intent.postResult = function() {};
+            launchData.intent.postFailure = function() {};
+            dispatch([launchData]);
+          }, function(fileError) {
+            console.error('Error getting fileEntry, code: ' + fileError.code);
+            dispatch([]);
+          });
+        } catch (e) {
+          console.error('Error in event handler for onLaunched: ' + e.stack);
+          dispatch([]);
+        }
+        break;
+      case('serialized'):
+        var deserializedData = DeserializeString(intentData.data);
+        launchData.intent.data = deserializedData;
+        launchData.intent.postResult = function() {};
+        launchData.intent.postFailure = function() {};
+        dispatch([launchData]);
+        break;
+      case('blob'):
+        var blobData = CreateBlob(intentData.blobFilePath,
+                                  intentData.blobLength);
+        launchData.intent.data = blobData;
+        launchData.intent.postResult = function() {};
+        launchData.intent.postFailure = function() {};
+        dispatch([launchData]);
+        break;
+      default:
+        console.error('Unexpected launch data format');
+        dispatch([]);
     }
-  };
+  } else if (launchData) {
+    dispatch([launchData]);
+  } else {
+    dispatch([]);
+  }
 });