TabContents -> WebContentsImpl, part 4.

content/browser/tab_contents/popup_menu_helper_mac.mm

-// 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.
-
-#import <Carbon/Carbon.h>
-
-#include "content/browser/tab_contents/popup_menu_helper_mac.h"
-
-#import "base/mac/scoped_sending_event.h"
-#include "base/memory/scoped_nsobject.h"
-#include "base/message_loop.h"
-#include "content/browser/renderer_host/render_view_host_impl.h"
-#include "content/browser/renderer_host/render_widget_host_view_mac.h"
-#include "content/public/browser/notification_source.h"
-#include "content/public/browser/notification_types.h"
-#import "ui/base/cocoa/base_view.h"
-#include "webkit/glue/webmenurunner_mac.h"
-
-using content::RenderViewHost;
-using content::RenderViewHostImpl;
-using content::RenderWidgetHost;
-
-PopupMenuHelper::PopupMenuHelper(RenderViewHost* render_view_host)
-    : render_view_host_(static_cast<RenderViewHostImpl*>(render_view_host)) {
-  notification_registrar_.Add(
-      this, content::NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
-      content::Source<RenderWidgetHost>(render_view_host));
-}
-
-void PopupMenuHelper::ShowPopupMenu(
-    const gfx::Rect& bounds,
-    int item_height,
-    double item_font_size,
-    int selected_item,
-    const std::vector<WebMenuItem>& items,
-    bool right_aligned) {
-  // Retain the Cocoa view for the duration of the pop-up so that it can't be
-  // dealloced if my Destroy() method is called while the pop-up's up (which
-  // would in turn delete me, causing a crash once the -runMenuInView
-  // call returns. That's what was happening in <http://crbug.com/33250>).
-  RenderWidgetHostViewMac* rwhvm =
-      static_cast<RenderWidgetHostViewMac*>(render_view_host_->GetView());
-  scoped_nsobject<RenderWidgetHostViewCocoa> cocoa_view
-      ([rwhvm->cocoa_view() retain]);
-
-  // Display the menu.
-  scoped_nsobject<WebMenuRunner> menu_runner;
-  menu_runner.reset([[WebMenuRunner alloc] initWithItems:items
-                                                fontSize:item_font_size
-                                            rightAligned:right_aligned]);
-
-  {
-    // Make sure events can be pumped while the menu is up.
-    MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
-
-    // One of the events that could be pumped is |window.close()|.
-    // User-initiated event-tracking loops protect against this by
-    // setting flags in -[CrApplication sendEvent:], but since
-    // web-content menus are initiated by IPC message the setup has to
-    // be done manually.
-    base::mac::ScopedSendingEvent sending_event_scoper;
-
-    // Now run a SYNCHRONOUS NESTED EVENT LOOP until the pop-up is finished.
-    [menu_runner runMenuInView:cocoa_view
-                    withBounds:[cocoa_view flipRectToNSRect:bounds]
-                  initialIndex:selected_item];
-  }
-
-  if (!render_view_host_) {
-    // Bad news, the RenderViewHost got deleted while we were off running the
-    // menu. Nothing to do.
-    return;
-  }
-
-  if ([menu_runner menuItemWasChosen]) {
-    render_view_host_->DidSelectPopupMenuItem(
-        [menu_runner indexOfSelectedItem]);
-  } else {
-    render_view_host_->DidCancelPopupMenu();
-  }
-}
-
-void PopupMenuHelper::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  DCHECK(type == content::NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED);
-  DCHECK(content::Source<RenderWidgetHost>(source).ptr() == render_view_host_);
-  render_view_host_ = NULL;
-}
-