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

android_webview/lib/aw_browser_dependency_factory_impl.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 "android_webview/lib/aw_browser_dependency_factory_impl.h"
 
 #include "android_webview/browser/aw_browser_context.h"
 #include "android_webview/browser/aw_content_browser_client.h"
 #include "base/lazy_instance.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "content/public/common/content_client.h"
 
 using content::BrowserContext;
 using content::WebContents;
 
 namespace android_webview {
 
 namespace {
 
 base::LazyInstance<AwBrowserDependencyFactoryImpl>::Leaky g_lazy_instance;
 
 }  // namespace
 
 AwBrowserDependencyFactoryImpl::AwBrowserDependencyFactoryImpl() {}
 
 AwBrowserDependencyFactoryImpl::~AwBrowserDependencyFactoryImpl() {}
 
 // static
 void AwBrowserDependencyFactoryImpl::InstallInstance() {
   SetInstance(g_lazy_instance.Pointer());
 }
 
 content::BrowserContext* AwBrowserDependencyFactoryImpl::GetBrowserContext() {
   return AwContentBrowserClient::GetAwBrowserContext();
 }
 
 WebContents* AwBrowserDependencyFactoryImpl::CreateWebContents() {
-  return content::WebContents::Create(
+  content::WebContents* web_contents = content::WebContents::Create(
       content::WebContents::CreateParams(GetBrowserContext()));
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents, FROM_HERE);

[Mike Wittman, 2015/11/11 17:15:28]

Web contents modal dialogs aren't supported on Android, so we don't need this
one. (+ three other cases)

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

Done.

+  return web_contents;
 }
 
 }  // namespace android_webview