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

chrome/browser/devtools/devtools_window.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/devtools/devtools_window.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
@@ skipping 29 matching lines @@
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_frame_host.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/user_metrics.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_constants.h"
 #include "net/base/escape.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
 using base::DictionaryValue;
 using blink::WebInputEvent;
@@ skipping 706 matching lines @@
     }
   }
 
   // Create WebContents with devtools.
   GURL url(GetDevToolsURL(profile, frontend_url,
                           shared_worker_frontend,
                           remote_frontend,
                           can_dock, settings));
   scoped_ptr<WebContents> main_web_contents(
       WebContents::Create(WebContents::CreateParams(profile)));
+  WebContentsSource::CreateForWebContentsAndLocation(main_web_contents.get(),
+                                                     FROM_HERE);
   main_web_contents->GetController().LoadURL(
       DecorateFrontendURL(url), content::Referrer(),
       ui::PAGE_TRANSITION_AUTO_TOPLEVEL, std::string());
   DevToolsUIBindings* bindings =
       DevToolsUIBindings::ForWebContents(main_web_contents.get());
   if (!bindings)
     return nullptr;
 
   return new DevToolsWindow(profile, main_web_contents.release(), bindings,
                             inspected_web_contents, can_dock);
@@ skipping 487 matching lines @@
 bool DevToolsWindow::ReloadInspectedWebContents(bool ignore_cache) {
   // Only route reload via front-end if the agent is attached.
   WebContents* wc = GetInspectedWebContents();
   if (!wc || wc->GetCrashedStatus() != base::TERMINATION_STATUS_STILL_RUNNING)
     return false;
   base::FundamentalValue ignore_cache_value(ignore_cache);
   bindings_->CallClientFunction("DevToolsAPI.reloadInspectedPage",
                                 &ignore_cache_value, nullptr, nullptr);
   return true;
 }