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

chrome/browser/ui/panels/panel_host.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/panels/panel_host.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 12 matching lines @@
 #include "components/ui/zoom/page_zoom.h"
 #include "components/ui/zoom/zoom_controller.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "extensions/browser/view_type_utils.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image.h"
 
 using base::UserMetricsAction;
 
 PanelHost::PanelHost(Panel* panel, Profile* profile)
     : panel_(panel),
       profile_(profile),
       weak_factory_(this) {
 }
 
 PanelHost::~PanelHost() {
 }
 
 void PanelHost::Init(const GURL& url) {
   if (url.is_empty())
     return;
 
   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);
   extensions::SetViewType(web_contents_.get(), extensions::VIEW_TYPE_PANEL);
   web_contents_->SetDelegate(this);
   // web_contents_ may be passed to PageZoom::Zoom(), so it needs
   // a ZoomController.
   ui_zoom::ZoomController::CreateForWebContents(web_contents_.get());
   content::WebContentsObserver::Observe(web_contents_.get());
 
   // Needed to give the web contents a Tab ID. Extension APIs
   // expect web contents to have a Tab ID.
   SessionTabHelper::CreateForWebContents(web_contents_.get());
@@ skipping 169 matching lines @@
 }
 
 void PanelHost::StopLoading() {
   content::RecordAction(UserMetricsAction("Stop"));
   web_contents_->Stop();
 }
 
 void PanelHost::Zoom(content::PageZoom zoom) {
   ui_zoom::PageZoom::Zoom(web_contents_.get(), zoom);
 }