Clear renderer compositor trees if new page does not render in 4 seconds

content/browser/renderer_host/render_widget_host_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 "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 1710 matching lines @@
     is_unresponsive_ = false;
     if (delegate_)
       delegate_->RendererResponsive(this);
   }
 }
 
 void RenderWidgetHostImpl::ClearDisplayedGraphics() {
   NotifyNewContentRenderingTimeoutForTesting();
   if (view_)
     view_->ClearCompositorFrame();
+  Send(new ViewMsg_ClearDisplayedContent(GetRoutingID()));
 }
 
 void RenderWidgetHostImpl::OnRenderProcessGone(int status, int exit_code) {
   // RenderFrameHost owns a RenderWidgetHost when it needs one, in which case
   // it handles destruction.
   if (!owned_by_render_frame_host_) {
     // TODO(evanm): This synchronously ends up calling "delete this".
     // Is that really what we want in response to this message?  I'm matching
     // previous behavior of the code here.
     Destroy(true);
@@ skipping 768 matching lines @@
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
     file_system_file.filesystem_id = filesystem_id;
   }
 }
 
 }  // namespace content