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

extensions/browser/extension_host.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 "extensions/browser/extension_host.h"
 
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.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/bad_message.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_error.h"
 #include "extensions/browser/extension_host_delegate.h"
 #include "extensions/browser/extension_host_observer.h"
 #include "extensions/browser/extension_host_queue.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extension_web_contents_observer.h"
 #include "extensions/browser/extensions_browser_client.h"
@@ skipping 31 matching lines @@
       is_render_view_creation_pending_(false),
       has_loaded_once_(false),
       document_element_available_(false),
       initial_url_(url),
       extension_host_type_(host_type) {
   // Not used for panels, see PanelHost.
   DCHECK(host_type == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE ||
          host_type == VIEW_TYPE_EXTENSION_DIALOG ||
          host_type == VIEW_TYPE_EXTENSION_POPUP);
   host_contents_.reset(WebContents::Create(
-      WebContents::CreateParams(browser_context_, site_instance))),
+      WebContents::CreateParams(browser_context_, site_instance)));
+  WebContentsSource::CreateForWebContentsAndLocation(host_contents_.get(),
+                                                     FROM_HERE);
   content::WebContentsObserver::Observe(host_contents_.get());
   host_contents_->SetDelegate(this);
   SetViewType(host_contents_.get(), host_type);
 
   render_view_host_ = host_contents_->GetRenderViewHost();
 
   // Listen for when an extension is unloaded from the same profile, as it may
   // be the same extension that this points to.
   ExtensionRegistry::Get(browser_context_)->AddObserver(this);
 
@@ skipping 402 matching lines @@
     }
   } else if (extension_host_type_ == VIEW_TYPE_EXTENSION_POPUP) {
     UMA_HISTOGRAM_MEDIUM_TIMES("Extensions.PopupLoadTime2",
                                load_start_->Elapsed());
     UMA_HISTOGRAM_MEDIUM_TIMES("Extensions.PopupCreateTime",
                                create_start_.Elapsed());
   }
 }
 
 }  // namespace extensions