Allow embedders to provide a custom view for popup (select box) widgets,

content/browser/web_contents/web_contents_view_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>
 
 #import "content/browser/web_contents/web_contents_view_mac.h"
 
 #include <string>
 
@@ skipping 124 matching lines @@
   // For some reason known only to Cocoa, the autorecalculation of the key view
   // loop set on the window doesn't set the next key view when the subview is
   // added. On 10.6 things magically work fine; on 10.5 they fail
   // <http://crbug.com/61493>. Digging into Cocoa key view loop code yielded
   // madness; TODO(avi,rohit): look at this again and figure out what's really
   // going on.
   [cocoa_view_.get() setNextKeyView:view_view];
   return view;
 }
 
+RenderWidgetHostView* WebContentsViewMac::CreateViewForPopupWidget(
+    RenderWidgetHost* render_widget_host) {
+  return RenderWidgetHostViewPort::CreateViewForWidget(render_widget_host);
+}
+
 gfx::NativeView WebContentsViewMac::GetNativeView() const {
   return cocoa_view_.get();
 }
 
 gfx::NativeView WebContentsViewMac::GetContentNativeView() const {
   RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
   if (!rwhv)
     return NULL;
   return rwhv->GetNativeView();
 }
@@ skipping 392 matching lines @@
       [[[notification userInfo] objectForKey:kSelectionDirection]
         unsignedIntegerValue];
   if (direction == NSDirectSelection)
     return;
 
   [self webContents]->
       FocusThroughTabTraversal(direction == NSSelectingPrevious);
 }
 
 @end