Add the onBeforeNavigate and onErrorOccured events to the webNavigation API.

chrome/common/notification_type.h

Index: chrome/common/notification_type.h
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index fa1febb79e463b47771e859ac392b1b9eac1dbc8..f502a007992f146f412f0eda81802ca79a0f432e 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -103,10 +103,17 @@ class NotificationType {
 
     // A frame is staring a provisional load.  The source is a
     // Source<NavigationController> corresponding to the tab in which the load
-    // occurs.  Details is a bool specifying if the load occurs in the main
-    // frame (or a sub-frame if false).
+    // occurs.  Details is a ProvisionalLoadDetails object.
     FRAME_PROVISIONAL_LOAD_START,
 
+    // The provisional load for a frame was committed. The source is a
+    // NavigationController corresponding to the tab in which the load occured.
+    // Details is a ProvisionalLoadDetails object. In contrast to
+    // NAV_ENTRY_COMMITTED, this notification is sent when the load was
+    // committed, even if no navigation entry was committed (such as
+    // AUTO_SUBFRAME navigations).
+    FRAME_PROVISIONAL_LOAD_COMMITTED,
+
     // Content was loaded from an in-memory cache.  The source will be a
     // Source<NavigationController> corresponding to the tab in which the load
     // occurred.  Details in the form of a LoadFromMemoryCacheDetails object