Add hasListener/hasListeners to webRequestEvents

BUG=none
TEST=ExtensionApiTest.WebRequestEvents


Review URL: http://codereview.chromium.org/7542010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95151 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 11 insertions, 1 deletions

diff --git a/chrome/renderer/resources/extension_process_bindings.js b/chrome/renderer/resources/extension_process_bindings.js
index 98e31cb..b2d10ff 100644
--- a/chrome/renderer/resources/extension_process_bindings.js
+++ b/chrome/renderer/resources/extension_process_bindings.js
@@ -274,6 +274,16 @@ var chrome = chrome || {};
     this.callbackMap_ = {};
   };
 
+  // Test if the given callback is registered for this event.
+  chrome.WebRequestEvent.prototype.hasListener = function(cb) {
+    return this.findListener_(cb) > -1;
+  };
+
+  // Test if any callbacks are registered fur thus event.
+  chrome.WebRequestEvent.prototype.hasListeners = function(cb) {
+    return this.subEvents_.length > 0;
+  };
+
   // Registers a callback to be called when this event is dispatched. If
   // opt_filter is specified, then the callback is only called for events that
   // match the given filters. If opt_extraInfo is specified, the given optional
diff --git a/chrome/test/data/extensions/api_test/webrequest/events/test.html b/chrome/test/data/extensions/api_test/webrequest/events/test.html
index 2a35531..181acda 100644
--- a/chrome/test/data/extensions/api_test/webrequest/events/test.html
+++ b/chrome/test/data/extensions/api_test/webrequest/events/test.html
@@ -226,7 +226,7 @@ function removeListeners() {
     for (var cb in event.callbackMap_) {
       event.removeListener(cb);
     }
-    chrome.test.assertEq(0, event.subEvents_.length);
+    chrome.test.assertFalse(event.hasListeners());
   }
   helper(chrome.experimental.webRequest.onBeforeRequest);
   helper(chrome.experimental.webRequest.onBeforeSendHeaders);