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

chrome/browser/ui/app_list/start_page_service.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/ui/app_list/start_page_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 29 matching lines @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/speech_recognition_session_preamble.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_source.h"
 #include "content/public/common/content_switches.h"
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/common/extension.h"
 #include "net/base/load_flags.h"
 #include "net/base/network_change_notifier.h"
 #include "net/url_request/url_fetcher.h"
 #include "ui/app_list/app_list_switches.h"
 
 #if defined(OS_CHROMEOS)
@@ skipping 544 matching lines @@
   for (const auto& cb : pending_webui_callbacks_)
     cb.Run();
   pending_webui_callbacks_.clear();
 
   FetchDoodleJson();
 }
 
 void StartPageService::LoadContents() {
   contents_.reset(content::WebContents::Create(
       content::WebContents::CreateParams(profile_)));
+  WebContentsSource::CreateForWebContentsAndLocation(contents_.get(),
+                                                     FROM_HERE);
   contents_delegate_.reset(new StartPageWebContentsDelegate(profile_));
   contents_->SetDelegate(contents_delegate_.get());
 
   // The ZoomController needs to be created before the web contents is observed
   // by this object. Otherwise it will react to DidNavigateMainFrame after this
   // object does, resetting the zoom mode in the process.
   ui_zoom::ZoomController::CreateForWebContents(contents_.get());
   Observe(contents_.get());
 
   LoadStartPageURL();
@@ skipping 68 matching lines @@
 
   // Check for a new doodle.
   content::BrowserThread::PostDelayedTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&StartPageService::FetchDoodleJson,
                  weak_factory_.GetWeakPtr()),
       recheck_delay);
 }
 
 }  // namespace app_list