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

chromecast/browser/cast_content_window.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 "chromecast/browser/cast_content_window.h"
 
 #include "base/threading/thread_restrictions.h"
 #include "chromecast/base/metrics/cast_metrics_helper.h"
 #include "chromecast/browser/cast_browser_process.h"
 #include "chromecast/media/base/video_plane_controller.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "ipc/ipc_message.h"
 
 #if defined(USE_AURA)
 #include "chromecast/graphics/cast_screen.h"
 #include "ui/aura/env.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #endif
 
@@ skipping 82 matching lines @@
 }
 
 scoped_ptr<content::WebContents> CastContentWindow::CreateWebContents(
     const gfx::Size& initial_size,
     content::BrowserContext* browser_context) {
   content::WebContents::CreateParams create_params(browser_context, NULL);
   create_params.routing_id = MSG_ROUTING_NONE;
   create_params.initial_size = initial_size;
   content::WebContents* web_contents = content::WebContents::Create(
       create_params);
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents, FROM_HERE);

[halliwell, 2015/11/11 14:14:31]

Think you can revert this file, your crash isn't in Chromecast ;)

[hcarmona, 2015/11/11 19:57:58]

Done.

   content::WebContentsObserver::Observe(web_contents);
   return make_scoped_ptr(web_contents);
 }
 
 void CastContentWindow::DidFirstVisuallyNonEmptyPaint() {
   metrics::CastMetricsHelper::GetInstance()->LogTimeToFirstPaint();
 }
 
 void CastContentWindow::MediaPaused() {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPause();
 }
 
 void CastContentWindow::MediaStartedPlaying() {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPlay();
 }
 
 void CastContentWindow::RenderViewCreated(
     content::RenderViewHost* render_view_host) {
   content::RenderWidgetHostView* view =
       render_view_host->GetWidget()->GetView();
   if (view)
     view->SetBackgroundColor(transparent_ ? SK_ColorTRANSPARENT
                                           : SK_ColorBLACK);
 }
 
 }  // namespace shell
 }  // namespace chromecast