Track where WebContents are created in order to better understand issue.

chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc

 // 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.
 
 #include "chrome/browser/ui/webui/constrained_web_dialog_delegate_base.h"
 
 #include <string>
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/ui/webui/chrome_web_contents_handler.h"
 #include "components/ui/zoom/zoom_controller.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "content/public/common/renderer_preferences.h"
 #include "ipc/ipc_message.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 #include "ui/web_dialogs/web_dialog_ui.h"
 
 using content::NativeWebKeyboardEvent;
 using content::WebContents;
 using ui::WebDialogDelegate;
 using ui::WebDialogWebContentsDelegate;
 
 ConstrainedWebDialogDelegateBase::ConstrainedWebDialogDelegateBase(
     content::BrowserContext* browser_context,
     WebDialogDelegate* delegate,
     WebDialogWebContentsDelegate* tab_delegate)
     : WebDialogWebContentsDelegate(browser_context,
                                    new ChromeWebContentsHandler),
       web_dialog_delegate_(delegate),
       closed_via_webui_(false),
       release_contents_on_close_(false) {
   CHECK(delegate);
   web_contents_.reset(
       WebContents::Create(WebContents::CreateParams(browser_context)));
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents_.get(),
+                                                     FROM_HERE);
   ui_zoom::ZoomController::CreateForWebContents(web_contents_.get());
   if (tab_delegate) {
     override_tab_delegate_.reset(tab_delegate);
     web_contents_->SetDelegate(tab_delegate);
   } else {
     web_contents_->SetDelegate(this);
   }
   content::RendererPreferences* prefs =
       web_contents_->GetMutableRendererPrefs();
   renderer_preferences_util::UpdateFromSystemSettings(
@@ skipping 59 matching lines @@
 
 gfx::Size ConstrainedWebDialogDelegateBase::GetMaximumSize() const {
   NOTREACHED();
   return gfx::Size();
 }
 
 gfx::Size ConstrainedWebDialogDelegateBase::GetPreferredSize() const {
   NOTREACHED();
   return gfx::Size();
 }