Plumb preamble log data from the hotword extension into the speech recognizer.

chrome/browser/ui/app_list/speech_recognizer.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_UI_APP_LIST_SPEECH_RECOGNIZER_H_
 #define CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 
+namespace content {
+struct SpeechRecognitionSessionPreamble;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace app_list {
 
 class SpeechRecognizerDelegate;
 
 // SpeechRecognizer is a wrapper around the speech recognition engine that
 // simplifies its use from the UI thread. This class handles all setup/shutdown,
 // collection of results, error cases, and threading.
 class SpeechRecognizer {
  public:
   SpeechRecognizer(const base::WeakPtr<SpeechRecognizerDelegate>& delegate,
                    net::URLRequestContextGetter* url_request_context_getter,
                    const std::string& locale);
   ~SpeechRecognizer();
 
-  // Start/stop the speech recognizer. Must be called on the UI thread.
-  void Start();
+  // Start/stop the speech recognizer. |preamble| contains the preamble audio to
+  // log if auth parameters are available.
+  // Must be called on the UI thread.
+  void Start(
+      const scoped_refptr<content::SpeechRecognitionSessionPreamble>& preamble);
   void Stop();
 
  private:
   class EventListener;
 
   base::WeakPtr<SpeechRecognizerDelegate> delegate_;
   scoped_refptr<EventListener> speech_event_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizer);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_H_