Add the onBeforeNavigate and onErrorOccured events to the webNavigation API.

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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 "chrome/browser/tab_contents/tab_contents.h"
 
 #if defined(OS_CHROMEOS)
 // For GdkScreen
 #include <gdk/gdk.h>
 #endif  // defined(OS_CHROMEOS)
@@ skipping 2434 matching lines @@
   // (see http://code.google.com/p/chromium/issues/detail?id=2929 )
   // TODO(jungshik): Add a test for the encoding menu to avoid
   // regressing it again.
   if (PageTransition::IsMainFrame(params.transition))
     contents_mime_type_ = params.contents_mime_type;
 
   NavigationController::LoadCommittedDetails details;
   bool did_navigate = controller_.RendererDidNavigate(
       params, extra_invalidate_flags, &details);
 
+  // Send notification about committed provisional loads. This notification is
+  // different from the NAV_ENTRY_COMMITTED notification which doesn't include
+  // the actual URL navigated to and isn't sent for AUTO_SUBFRAME navigations.
+  if (details.type != NavigationType::NAV_IGNORE) {
+    ProvisionalLoadDetails load_details(details.is_main_frame,
+                                        details.is_in_page,
+                                        params.url, std::string(), false);
+    load_details.set_transition_type(params.transition);
+    // Whether or not a page transition was triggered by going backward or
+    // forward in the history is only stored in the navigation controller's
+    // entry list.
+    if (did_navigate &&
+        (controller_.GetActiveEntry()->transition_type() &
+            PageTransition::FORWARD_BACK)) {
+      load_details.set_transition_type(
+          params.transition | PageTransition::FORWARD_BACK);
+    }
+    NotificationService::current()->Notify(
+        NotificationType::FRAME_PROVISIONAL_LOAD_COMMITTED,
+        Source<NavigationController>(&controller_),
+        Details<ProvisionalLoadDetails>(&load_details));
+
+  }
+
   // Update history. Note that this needs to happen after the entry is complete,
   // which WillNavigate[Main,Sub]Frame will do before this function is called.
   if (params.should_update_history) {
     // Most of the time, the displayURL matches the loaded URL, but for about:
     // URLs, we use a data: URL as the real value.  We actually want to save the
     // about: URL to the history db and keep the data: URL hidden. This is what
     // the TabContents' URL getter does.
     scoped_refptr<history::HistoryAddPageArgs> add_page_args(
         CreateHistoryAddPageArgs(GetURL(), details, params));
     if (!delegate() ||
@@ skipping 806 matching lines @@
   AddInfoBar(new SavePasswordInfoBarDelegate(this, form_to_save));
 }
 
 Profile* TabContents::GetProfileForPasswordManager() {
   return profile();
 }
 
 bool TabContents::DidLastPageLoadEncounterSSLErrors() {
   return controller().ssl_manager()->ProcessedSSLErrorFromRequest();
 }