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

chrome/browser/ui/app_list/speech_recognizer_browsertest.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/speech_recognizer.h"
 
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 71 matching lines @@
   SpeechRecognizer recognizer(mock_speech_delegate_->GetWeakPtr(),
                               browser()->profile()->GetRequestContext(),
                               "en");
 
   base::RunLoop run_loop;
   EXPECT_CALL(*mock_speech_delegate_,
               OnSpeechResult(base::ASCIIToUTF16("Pictures of the moon"), true));
   EXPECT_CALL(*mock_speech_delegate_,
               OnSpeechRecognitionStateChanged(SPEECH_RECOGNITION_READY))
       .WillOnce(InvokeWithoutArgs(&run_loop, &base::RunLoop::Quit));
-  recognizer.Start();
+  recognizer.Start(nullptr);
   run_loop.Run();
 }
 
 }  // namespace app_list