[ChromeDriver] Select the main frame if a non-existant child frame is targeted.

chrome/test/chromedriver/session_command.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 "chrome/test/chromedriver/session_command.h"
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome.h"
 #include "chrome/test/chromedriver/session.h"
 #include "chrome/test/chromedriver/session_map.h"
 #include "chrome/test/chromedriver/status.h"
 
-namespace {
-
-Status WaitForPendingNavigations(const Session& session) {
-  if (!session.chrome)
-    return Status(kOk);
-  std::string frame = session.frame;
-  if (frame == "") {
-    Status status = session.chrome->GetMainFrame(&frame);
-    if (status.IsError())
-      return status;
-  }
-  return session.chrome->WaitForPendingNavigations(frame);
-}
-
-} // namespace
-
 Status ExecuteSessionCommand(
     SessionMap* session_map,
     const SessionCommand& command,
     const base::DictionaryValue& params,
     const std::string& session_id,
     scoped_ptr<base::Value>* out_value,
     std::string* out_session_id) {
   *out_session_id = session_id;
   scoped_refptr<SessionAccessor> session_accessor;
   if (!session_map->Get(session_id, &session_accessor))
     return Status(kNoSuchSession, session_id);
   scoped_ptr<base::AutoLock> session_lock;
   Session* session = session_accessor->Access(&session_lock);
   if (!session)
     return Status(kNoSuchSession, session_id);
 
-  Status nav_status = WaitForPendingNavigations(*session);
+  Status nav_status = session->WaitForPendingNavigations();
   if (nav_status.IsError())
     return nav_status;
   Status status = command.Run(session, params, out_value);
-  nav_status = WaitForPendingNavigations(*session);
+  // Switch to main frame and retry command if subframe no longer exists.
+  if (status.code() == kNoSuchFrame) {

[kkania, 2013/02/06 23:45:26]

I'm worried this might not be correct for all circumstances, but I can't think
of anything, so ok!

[craigdh, 2013/02/07 00:05:37]

When the inevitable bugs raise their heads assign them to me and I shall squash
them.

+    session->frame = "";
+    nav_status = session->WaitForPendingNavigations();
+    if (nav_status.IsError())
+      return nav_status;
+    status = command.Run(session, params, out_value);
+  }
+  nav_status = session->WaitForPendingNavigations();
   if (status.IsOk() && nav_status.IsError() &&
       nav_status.code() != kDisconnected)
     return nav_status;
   return status;
 }