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

content/shell/browser/shell.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 "content/shell/browser/shell.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.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 "content/public/common/content_switches.h"
 #include "content/public/common/renderer_preferences.h"
 #include "content/public/common/webrtc_ip_handling_policy.h"
 #include "content/shell/browser/blink_test_controller.h"
 #include "content/shell/browser/layout_test/layout_test_bluetooth_chooser_factory.h"
 #include "content/shell/browser/layout_test/layout_test_devtools_frontend.h"
 #include "content/shell/browser/layout_test/layout_test_javascript_dialog_manager.h"
 #include "content/shell/browser/notify_done_forwarder.h"
 #include "content/shell/browser/shell_browser_main_parts.h"
 #include "content/shell/browser/shell_content_browser_client.h"
@@ skipping 133 matching lines @@
   return GetShellDefaultSize();
 }
 
 Shell* Shell::CreateNewWindow(BrowserContext* browser_context,
                               const GURL& url,
                               SiteInstance* site_instance,
                               const gfx::Size& initial_size) {
   WebContents::CreateParams create_params(browser_context, site_instance);
   create_params.initial_size = AdjustWindowSize(initial_size);
   WebContents* web_contents = WebContents::Create(create_params);
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents, FROM_HERE);
   Shell* shell = CreateShell(web_contents, create_params.initial_size);
   if (!url.is_empty())
     shell->LoadURL(url);
   return shell;
 }
 
 void Shell::LoadURL(const GURL& url) {
   LoadURLForFrame(url, std::string());
 }
 
@@ skipping 254 matching lines @@
   devtools_frontend_->Activate();
   devtools_frontend_->Focus();
 }
 
 void Shell::OnDevToolsWebContentsDestroyed() {
   devtools_observer_.reset();
   devtools_frontend_ = NULL;
 }
 
 }  // namespace content