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

chrome/browser/chromeos/first_run/drive_first_run_controller.cc

 // Copyright 2013 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/chromeos/first_run/drive_first_run_controller.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 16 matching lines @@
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_source.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_delegate.h"
 #include "url/gurl.h"
@@ skipping 160 matching lines @@
 DriveWebContentsManager::~DriveWebContentsManager() {
 }
 
 void DriveWebContentsManager::StartLoad() {
   started_ = true;
   const GURL url(endpoint_url_);
   content::WebContents::CreateParams create_params(
         profile_, content::SiteInstance::CreateForURL(profile_, url));
 
   web_contents_.reset(content::WebContents::Create(create_params));
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents_.get(),
+                                                     FROM_HERE);
   web_contents_->SetDelegate(this);
   extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
       web_contents_.get());
 
   content::NavigationController::LoadURLParams load_params(url);
   load_params.transition_type = ui::PAGE_TRANSITION_GENERATED;
   web_contents_->GetController().LoadURLWithParams(load_params);
 
   content::WebContentsObserver::Observe(web_contents_.get());
 }
@@ skipping 239 matching lines @@
           resource_bundle.GetImageNamed(IDR_NOTIFICATION_DRIVE),
           base::UTF8ToUTF16(extension->name()), GURL(),
           message_center::NotifierId(message_center::NotifierId::APPLICATION,
                                      kDriveHostedAppId),
           data, new DriveOfflineNotificationDelegate(profile_)));
   notification->set_priority(message_center::LOW_PRIORITY);
   message_center::MessageCenter::Get()->AddNotification(notification.Pass());
 }
 
 }  // namespace chromeos