Add base_url to DriveApiUrlGenerator.

chrome/browser/chromeos/drive/drive_api_service.h

Index: chrome/browser/chromeos/drive/drive_api_service.h
diff --git a/chrome/browser/chromeos/drive/drive_api_service.h b/chrome/browser/chromeos/drive/drive_api_service.h
index 55b582c27a3329f5b9eb2bc17fae6198b1c88093..452a0babe0ebf13de7911345eddbdb91241f4ea3 100644
--- a/chrome/browser/chromeos/drive/drive_api_service.h
+++ b/chrome/browser/chromeos/drive/drive_api_service.h
@@ -39,10 +39,12 @@ class DriveAPIService : public google_apis::DriveServiceInterface,
   // DriveFileSystem.
   //
   // |url_request_context_getter| is used to initialize URLFetcher.
+  // |base_url| is used to generate URLs for communication with the drive API.
   // |custom_user_agent| will be used for the User-Agent header in HTTP
   // requests issues through the service if the value is not empty.
   DriveAPIService(
       net::URLRequestContextGetter* url_request_context_getter,
+      const GURL& base_url,
       const std::string& custom_user_agent);
   virtual ~DriveAPIService();