Makes instant run before unload listeners.

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"
 
 #include <cmath>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 823 matching lines @@
 void TabContents::HideContents() {
   // TODO(pkasting): http://b/1239839  Right now we purposefully don't call
   // our superclass HideContents(), because some callers want to be very picky
   // about the order in which these get called.  In addition to making the code
   // here practically impossible to understand, this also means we end up
   // calling TabContents::WasHidden() twice if callers call both versions of
   // HideContents() on a TabContents.
   WasHidden();
 }
 
+bool TabContents::NeedToFireBeforeUnload() {
+  return notify_disconnection() &&
+      !showing_interstitial_page() &&
+      !render_view_host()->SuddenTerminationAllowed();
+}
+
 void TabContents::OpenURL(const GURL& url, const GURL& referrer,
                           WindowOpenDisposition disposition,
                           PageTransition::Type transition) {
   if (delegate_)
     delegate_->OpenURLFromTab(this, url, referrer, disposition, transition);
 }
 
 bool TabContents::NavigateToPendingEntry(
     NavigationController::ReloadType reload_type) {
   return NavigateToEntry(*controller_.pending_entry(), reload_type);
@@ skipping 1934 matching lines @@
                             default_prompt, show_suppress_checkbox, reply_msg);
   } else {
     // If we are suppressing messages, just reply as is if the user immediately
     // pressed "Cancel".
     OnMessageBoxClosed(reply_msg, false, std::wstring());
   }
 }
 
 void TabContents::RunBeforeUnloadConfirm(const std::wstring& message,
                                          IPC::Message* reply_msg) {
+  if (delegate())
+    delegate()->WillRunBeforeUnloadConfirm();
   if (delegate() && delegate()->ShouldSuppressDialogs()) {
     render_view_host()->JavaScriptMessageBoxClosed(reply_msg, true,
                                                    std::wstring());
     return;
   }
   is_showing_before_unload_dialog_ = true;
   RunBeforeUnloadDialog(this, message, reply_msg);
 }
 
 void TabContents::ShowModalHTMLDialog(const GURL& url, int width, int height,
@@ skipping 445 matching lines @@
 }
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = CharacterEncoding::GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::SetAppIcon(const SkBitmap& app_icon) {
   app_icon_ = app_icon;
   NotifyNavigationStateChanged(INVALIDATE_TITLE);
 }