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

chrome/browser/background/background_contents.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/background/background_contents.h"
 
 #include "base/profiler/scoped_tracker.h"
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/task_management/web_contents_tags.h"
 #include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/session_storage_namespace.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "extensions/browser/deferred_start_render_host_observer.h"
 #include "extensions/browser/extension_host_delegate.h"
 #include "extensions/browser/extension_host_queue.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/view_type_utils.h"
 #include "ui/gfx/geometry/rect.h"
 
 using content::SiteInstance;
 using content::WebContents;
 
@@ skipping 17 matching lines @@
   create_params.main_frame_widget_routing_id = main_frame_widget_routing_id;
   create_params.renderer_initiated_creation = routing_id != MSG_ROUTING_NONE;
   if (session_storage_namespace) {
     content::SessionStorageNamespaceMap session_storage_namespace_map;
     session_storage_namespace_map.insert(
         std::make_pair(partition_id, session_storage_namespace));
     web_contents_.reset(WebContents::CreateWithSessionStorage(
         create_params, session_storage_namespace_map));
   } else {
     web_contents_.reset(WebContents::Create(create_params));
+    WebContentsSource::CreateForWebContentsAndLocation(web_contents_.get(),
+                                                       FROM_HERE);
   }
   extensions::SetViewType(
       web_contents_.get(), extensions::VIEW_TYPE_BACKGROUND_CONTENTS);
   web_contents_->SetDelegate(this);
   content::WebContentsObserver::Observe(web_contents_.get());
   extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
       web_contents_.get());
 
   // Add the TaskManager-specific tag for the BackgroundContents.
   task_management::WebContentsTags::CreateForBackgroundContents(
@@ skipping 146 matching lines @@
 
 void BackgroundContents::AddDeferredStartRenderHostObserver(
     extensions::DeferredStartRenderHostObserver* observer) {
   deferred_start_render_host_observer_list_.AddObserver(observer);
 }
 
 void BackgroundContents::RemoveDeferredStartRenderHostObserver(
     extensions::DeferredStartRenderHostObserver* observer) {
   deferred_start_render_host_observer_list_.RemoveObserver(observer);
 }