[chromedriver] Implement reconnection to DevTools.

chrome/test/chromedriver/window_commands.cc

 // Copyright (c) 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 "chrome/test/chromedriver/window_commands.h"
 
 #include <list>
 
 #include "base/callback.h"
 #include "base/string_number_conversions.h"
@@ skipping 34 matching lines @@
   if (status.IsError())
     return status;
   if (is_dialog_open)
     return Status(kUnexpectedAlertOpen);
 
   WebView* web_view = NULL;
   status = session->GetTargetWindow(&web_view);
   if (status.IsError())
     return status;
 
+  status = web_view->EnsureAlive();
+  if (status.IsError())
+    return status;
+
   Status nav_status = web_view->WaitForPendingNavigations(session->frame);
   if (nav_status.IsError())
     return nav_status;
   status = command.Run(session, web_view, params, value);
   // Switch to main frame and retry command if subframe no longer exists.
   if (status.code() == kNoSuchFrame) {
     session->frame = "";
     nav_status = web_view->WaitForPendingNavigations(session->frame);
     if (nav_status.IsError())
       return nav_status;
@@ skipping 269 matching lines @@
     return status;
   std::list<MouseEvent> events;
   events.push_back(
       MouseEvent(kPressedMouseEventType, button,
                  session->mouse_position.x, session->mouse_position.y, 2));
   events.push_back(
       MouseEvent(kReleasedMouseEventType, button,
                  session->mouse_position.x, session->mouse_position.y, 2));
   return web_view->DispatchMouseEvents(events);
 }