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

chrome/browser/search/hotword_client.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_SEARCH_HOTWORD_CLIENT_H_
 #define CHROME_BROWSER_SEARCH_HOTWORD_CLIENT_H_
 
+#include "base/memory/ref_counted.h"
+
+namespace content {
+struct SpeechRecognitionSessionPreamble;
+}
+
 class HotwordClient {
  public:
   virtual ~HotwordClient() {}
 
   // Called when the hotword recognition session state has been changed.
   virtual void OnHotwordStateChanged(bool started) {}
 
   // Called when the hotword is recognized.
-  virtual void OnHotwordRecognized() = 0;
+  virtual void OnHotwordRecognized(
+      const scoped_refptr<content::SpeechRecognitionSessionPreamble>& preamble)
+      = 0;
 };
 
 #endif  // CHROME_BROWSER_SEARCH_HOTWORD_CLIENT_H_