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

blimp/engine/browser/blimp_engine_session.cc

 // Copyright 2015 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 "blimp/engine/browser/blimp_engine_session.h"
 
 #include "blimp/common/proto/blimp_message.pb.h"
 #include "blimp/common/proto/control.pb.h"
 #include "blimp/engine/browser/blimp_browser_context.h"
 #include "blimp/engine/ui/blimp_layout_manager.h"
 #include "blimp/engine/ui/blimp_screen.h"
 #include "blimp/engine/ui/blimp_ui_context_factory.h"
 #include "blimp/net/blimp_connection.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_source.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/wm/core/base_focus_rules.h"
 #include "ui/wm/core/default_activation_client.h"
 #include "ui/wm/core/focus_controller.h"
 
 #if !defined(USE_X11)
 #include "blimp/engine/ui/blimp_window_tree_host.h"
@@ skipping 56 matching lines @@
   window_tree_host_->SetBounds(gfx::Rect(screen_->GetPrimaryDisplay().size()));
 }
 
 void BlimpEngineSession::CreateWebContents(const int target_tab_id) {
   // TODO(haibinlu): Support more than one active WebContents (crbug/547231).
   DCHECK(!web_contents_);
   content::WebContents::CreateParams create_params(browser_context_.get(),
                                                    nullptr);
   scoped_ptr<content::WebContents> new_contents =
       make_scoped_ptr(content::WebContents::Create(create_params));
+  WebContentsSource::CreateForWebContentsAndLocation(web_contents.get(),

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

I don't think blimp is used on desktop, so this probably can also be reverted.

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

Done.

+                                                     FROM_HERE);
   PlatformSetContents(new_contents.Pass());
 }
 
 void BlimpEngineSession::LoadUrl(const int target_tab_id, const GURL& url) {
   if (url.is_empty() || !web_contents_)
     return;
 
   content::NavigationController::LoadURLParams params(url);
   params.transition_type = ui::PageTransitionFromInt(
       ui::PAGE_TRANSITION_TYPED | ui::PAGE_TRANSITION_FROM_ADDRESS_BAR);
@@ skipping 84 matching lines @@
 
   aura::Window* parent = window_tree_host_->window();
   aura::Window* content = web_contents_->GetNativeView();
   if (!parent->Contains(content))
     parent->AddChild(content);
   content->Show();
 }
 
 }  // namespace engine
 }  // namespace blimp