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

chrome/browser/extensions/bookmark_app_helper.cc

 // Copyright 2014 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/extensions/bookmark_app_helper.h"
 
 #include <cctype>
 #include <string>
 
 #include "base/prefs/pref_service.h"
@@ skipping 13 matching lines @@
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "chrome/common/url_constants.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/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/image_loader.h"
 #include "extensions/browser/notification_types.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_handlers/icons_handler.h"
 #include "extensions/common/url_pattern.h"
 #include "grit/platform_locale_settings.h"
@@ skipping 198 matching lines @@
     // missing icons which are not correctly extracted from a favicon.
     // (The eventual error indicates that there are missing files, which
     // are the not-extracted favicon images).
     //
     // TODO(dominickn): refactor bookmark app syncing to reuse one web
     // contents for all pending synced bookmark apps. This will avoid
     // pathological cases where n renderers for n bookmark apps are spun up on
     // first sign-in to a new machine.
     web_contents_.reset(content::WebContents::Create(
         content::WebContents::CreateParams(service_->profile())));
+    WebContentsSource::CreateForWebContentsAndLocation(web_contents_.get(),
+                                                       FROM_HERE);
     Observe(web_contents_.get());
 
     // Load about:blank so that the process actually starts.
     // Image download continues in DidFinishLoad.
     content::NavigationController::LoadURLParams load_params(
         GURL("about:blank"));
     load_params.transition_type = ui::PAGE_TRANSITION_GENERATED;
     web_contents_->GetController().LoadURLWithParams(load_params);
   }
 
@@ skipping 533 matching lines @@
       extension, info_list, base::Bind(&OnIconsLoaded, web_app_info, callback));
 }
 
 bool IsValidBookmarkAppUrl(const GURL& url) {
   URLPattern origin_only_pattern(Extension::kValidBookmarkAppSchemes);
   origin_only_pattern.SetMatchAllURLs(true);
   return url.is_valid() && origin_only_pattern.MatchesURL(url);
 }
 
 }  // namespace extensions