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

components/dom_distiller/content/browser/distiller_page_web_contents.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 "components/dom_distiller/content/browser/distiller_page_web_contents.h"
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/dom_distiller/content/browser/distiller_javascript_utils.h"
 #include "components/dom_distiller/content/browser/web_contents_main_frame_observer.h"
 #include "components/dom_distiller/core/distiller_page.h"
 #include "components/dom_distiller/core/dom_distiller_constants.h"
 #include "components/dom_distiller/core/dom_distiller_service.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_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 "ui/gfx/screen.h"
 #include "url/gurl.h"
 
 namespace dom_distiller {
 
 SourcePageHandleWebContents::SourcePageHandleWebContents(
     content::WebContents* web_contents,
     bool owned)
     : web_contents_(web_contents), owned_(owned) {
 }
@@ skipping 80 matching lines @@
     CreateNewWebContents(url);
   }
 }
 
 void DistillerPageWebContents::CreateNewWebContents(const GURL& url) {
   // Create new WebContents to use for distilling the content.
   content::WebContents::CreateParams create_params(browser_context_);
   create_params.initially_hidden = true;
   content::WebContents* web_contents =
       content::WebContents::Create(create_params);
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents, FROM_HERE);
   DCHECK(web_contents);
 
   web_contents->SetDelegate(this);
 
   // Start observing WebContents and load the requested URL.
   content::WebContentsObserver::Observe(web_contents);
   content::NavigationController::LoadURLParams params(url);
   web_contents->GetController().LoadURLWithParams(params);
 
   source_page_handle_.reset(
@@ skipping 67 matching lines @@
   if (!javascript_start.is_null()) {
     base::TimeDelta javascript_time = base::TimeTicks::Now() - javascript_start;
     UMA_HISTOGRAM_TIMES("DomDistiller.Time.RunJavaScript", javascript_time);
     DVLOG(1) << "DomDistiller.Time.RunJavaScript = " << javascript_time;
   }
 
   DistillerPage::OnDistillationDone(page_url, value);
 }
 
 }  // namespace dom_distiller