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

chrome/browser/ui/app_list/start_page_service.h

Index: chrome/browser/ui/app_list/start_page_service.h
diff --git a/chrome/browser/ui/app_list/start_page_service.h b/chrome/browser/ui/app_list/start_page_service.h
index 34938530e512ffa9c91a20280e16a079012dc84f..439d1fd8e930a96e3764a217e5df2fc5335597d2 100644
--- a/chrome/browser/ui/app_list/start_page_service.h
+++ b/chrome/browser/ui/app_list/start_page_service.h
@@ -22,6 +22,10 @@
 #include "content/public/browser/web_contents.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
+namespace content {
+struct SpeechRecognitionSessionPreamble;
+}
+
 namespace extensions {
 class Extension;
 }
@@ -50,7 +54,8 @@ class StartPageService : public KeyedService,
 
   void AppListShown();
   void AppListHidden();
-  void ToggleSpeechRecognition();
+  void ToggleSpeechRecognition(
+      const scoped_refptr<content::SpeechRecognitionSessionPreamble>& preamble);
 
   // Called when the WebUI has finished loading.
   void WebUILoaded();