Add test for ChromeVox injection into webview

chrome/browser/chromeos/accessibility/speech_monitor.h

Index: chrome/browser/chromeos/accessibility/speech_monitor.h
diff --git a/chrome/browser/chromeos/accessibility/speech_monitor.h b/chrome/browser/chromeos/accessibility/speech_monitor.h
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+// Copyright (c) 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_CHROMEOS_ACCESSIBILITY_SPEECH_MONITOR_H_
+#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPEECH_MONITOR_H_
+
+#include <deque>
+
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/speech/tts_platform.h"
+#include "content/public/test/test_utils.h"
+
+namespace chromeos {
+
+// For testing purpose installs itself as the platform speech synthesis engine,
+// allowing it to intercept all speech calls, and then provides a method to
+// block until the next utterance is spoken.
+class SpeechMonitor : public TtsPlatformImpl {
+ public:
+  SpeechMonitor();
+  virtual ~SpeechMonitor();
+
+  // Blocks until the next utterance is spoken, and returns its text.
+  std::string GetNextUtterance();
+
+  // Wait for next utterance and return true if next utterance is ChromeVox
+  // enabled message.
+  bool SkipChromeVoxEnabledMessage();
+
+  // TtsPlatformImpl implementation.
+  virtual bool PlatformImplAvailable() OVERRIDE;
+  virtual bool Speak(
+      int utterance_id,
+      const std::string& utterance,
+      const std::string& lang,
+      const VoiceData& voice,
+      const UtteranceContinuousParameters& params) OVERRIDE;
+  virtual bool StopSpeaking() OVERRIDE;
+  virtual bool IsSpeaking() OVERRIDE;
+  virtual void GetVoices(std::vector<VoiceData>* out_voices) OVERRIDE;
+  virtual void Pause() OVERRIDE {}
+  virtual void Resume() OVERRIDE {}
+  virtual std::string error() OVERRIDE;
+  virtual void clear_error() OVERRIDE {}
+  virtual void set_error(const std::string& error) OVERRIDE {}
+  virtual void WillSpeakUtteranceWithVoice(
+      const Utterance* utterance, const VoiceData& voice_data) OVERRIDE;
+
+ private:
+  scoped_refptr<content::MessageLoopRunner> loop_runner_;
+  std::deque<std::string> utterance_queue_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpeechMonitor);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPEECH_MONITOR_H_