Implements InputMethodTSF::IsCandidatePopupOpen().

ui/base/ime/win/tsf_event_router.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 "ui/base/ime/win/tsf_event_router.h"
 
 #include <msctf.h>
 #include <set>
 #include <utility>
 
@@ skipping 175 matching lines @@
     ui_source_->UnadviseSink(ui_source_cookie_);
     ui_source_.Release();
   }
   ui_source_cookie_ = TF_INVALID_COOKIE;
 
   if (!thread_manager)
     return;
 
   base::win::ScopedComPtr<ITfDocumentMgr> document_manager;
   if (FAILED(thread_manager->GetFocus(document_manager.Receive())) ||
+      !document_manager.get() ||
       FAILED(document_manager->GetBase(context_.Receive())) ||
       FAILED(context_source_.QueryFrom(context_)))
     return;
   context_source_->AdviseSink(IID_ITfTextEditSink,
                               static_cast<ITfTextEditSink*>(this),
                               &context_source_cookie_);
 
   if (FAILED(ui_element_manager_.QueryFrom(thread_manager)) ||
       FAILED(ui_source_.QueryFrom(ui_element_manager_)))
     return;
@@ skipping 91 matching lines @@
 
 void TSFEventRouter::OnTSFEndComposition() {
   observer_->OnTSFEndComposition();
 }
 
 void TSFEventRouter::SetManager(ITfThreadMgr* thread_manager) {
   delegate_->SetManager(thread_manager);
 }
 
 }  // namespace ui