Add OAuth2 authentication for some voice transcription requests.

chrome/browser/ui/app_list/speech_recognizer_delegate.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_DELEGATE_H_
 #define CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_
 
 #include <stdint.h>
+#include <string>
 
 #include "base/strings/string16.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace app_list {
 
@@ skipping 11 matching lines @@
 
   // Invoked when the state of speech recognition is changed.
   virtual void OnSpeechRecognitionStateChanged(
       SpeechRecognitionState new_state) = 0;
 
   // Return a WebContents that is whitelisted to use the speech recognizer.
   // TODO(amistry): This is an implementation detail that shouldn't be
   // necessary. Somehow, eliminate this dependency.
   virtual content::WebContents* GetSpeechContents() = 0;
 
+  // Get the OAuth2 scope and token to pass to the speech recognizer. Does not
+  // modify the arguments if no auth token is available or allowed.
+  virtual void GetSpeechAuthParameters(std::string* auth_scope,
+                                       std::string* auth_token) = 0;
+
  protected:
   virtual ~SpeechRecognizerDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_