Fix threading bug in the brlapi braille controller

chrome/browser/extensions/api/braille_display_private/braille_display_private_apitest.cc

 // Copyright 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.
 
 #ifndef USE_BRLAPI
 #error This test requires brlapi.
 #endif
 
 #include <deque>
 
@@ skipping 70 matching lines @@
     return true;
   }
 
   virtual bool WriteDots(const unsigned char* cells) OVERRIDE {
     std::string written(reinterpret_cast<const char*>(cells),
                         data_->display_size);
     data_->written_content.push_back(written);
     return true;
   }
 
-  virtual int ReadKey(brlapi_keyCode_t* key_code) {
+  virtual int ReadKey(brlapi_keyCode_t* key_code) OVERRIDE {
     if (!data_->pending_keys.empty()) {
       int queued_key_code = data_->pending_keys.front();
       data_->pending_keys.pop_front();
       if (queued_key_code < 0) {
         data_->error.brlerrno = BRLAPI_ERROR_EOF;
         return -1;  // Signal error.
       }
       *key_code = queued_key_code;
       return 1;
     } else {
@@ skipping 11 matching lines @@
                                         base::Unretained(this)));
     }
   }
 
   MockBrlapiConnectionData* data_;
   OnDataReadyCallback on_data_ready_;
 };
 
 class BrailleDisplayPrivateApiTest : public ExtensionApiTest {
  public:
-  virtual void SetUpInProcessBrowserTestFixture() {
+  virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
     ExtensionApiTest::SetUpInProcessBrowserTestFixture();
     connection_data_.connected = false;
     connection_data_.display_size = 0;
     connection_data_.error.brlerrno = BRLAPI_ERROR_SUCCESS;
     connection_data_.reappear_on_disconnect = false;
     BrailleControllerImpl::GetInstance()->SetCreateBrlapiConnectionForTesting(
         base::Bind(
             &BrailleDisplayPrivateApiTest::CreateBrlapiConnection,
             base::Unretained(this)));
   }
@@ skipping 36 matching lines @@
   connection_data_.display_size = 11;
   connection_data_.pending_keys.push_back(-1);
   connection_data_.reappear_on_disconnect = true;
   ASSERT_TRUE(RunComponentExtensionTest(
       "braille_display_private/display_state_changes"));
 }
 
 }  // namespace braille_display_private
 }  // namespace api
 }  // namespace extensions