Improve TTS GetMatchingVoices algorithm

chrome/browser/speech/tts_controller_impl.h

 // Copyright 2014 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 CHROME_BROWSER_SPEECH_TTS_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_SPEECH_TTS_CONTROLLER_IMPL_H_
 
 #include <memory>
 #include <queue>
 #include <set>
 #include <string>
 #include <vector>
 
+#include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 }
 
 // Singleton class that manages text-to-speech for the TTS and TTS engine
@@ skipping 23 matching lines @@
   void SetTtsEngineDelegate(TtsEngineDelegate* delegate) override;
   TtsEngineDelegate* GetTtsEngineDelegate() override;
   void SetPlatformImpl(TtsPlatformImpl* platform_impl) override;
   int QueueSize() override;
 
  protected:
   TtsControllerImpl();
   ~TtsControllerImpl() override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(TtsControllerTest, TestGetMatchingVoice);
+
   // Get the platform TTS implementation (or injected mock).
   TtsPlatformImpl* GetPlatformImpl();
 
   // Start speaking the given utterance. Will either take ownership of
   // |utterance| or delete it if there's an error. Returns true on success.
   void SpeakNow(Utterance* utterance);
 
   // Clear the utterance queue. If send_events is true, will send
   // TTS_EVENT_CANCELLED events on each one.
   void ClearUtteranceQueue(bool send_events);
@@ skipping 27 matching lines @@
   // dependency injection.
   TtsPlatformImpl* platform_impl_;
 
   // The delegate that processes TTS requests with user-installed extensions.
   TtsEngineDelegate* tts_engine_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TtsControllerImpl);
 };
 
 #endif  // CHROME_BROWSER_SPEECH_TTS_CONTROLLER_IMPL_H_