Add OAuth2 authentication for some voice transcription requests.

chrome/browser/ui/app_list/speech_recognizer_delegate.h

Index: chrome/browser/ui/app_list/speech_recognizer_delegate.h
diff --git a/chrome/browser/ui/app_list/speech_recognizer_delegate.h b/chrome/browser/ui/app_list/speech_recognizer_delegate.h
index 22969cdf492f354ace780ab852a6cc8f5badb38f..2ce420613af6d4adee7572bebe8c38681e69d835 100644
--- a/chrome/browser/ui/app_list/speech_recognizer_delegate.h
+++ b/chrome/browser/ui/app_list/speech_recognizer_delegate.h
@@ -6,6 +6,7 @@
 #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"
@@ -37,6 +38,11 @@ class SpeechRecognizerDelegate {
   // 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() {}
 };