Use GData WAPI's third party app authorization operation for Drive API v2.

chrome/browser/google_apis/drive_api_service.h

Index: chrome/browser/google_apis/drive_api_service.h
diff --git a/chrome/browser/google_apis/drive_api_service.h b/chrome/browser/google_apis/drive_api_service.h
index d209efdf10650000186e5516e01e31ee07145fad..4c0e033842f5368c65f9921b74faad947264ebb6 100644
--- a/chrome/browser/google_apis/drive_api_service.h
+++ b/chrome/browser/google_apis/drive_api_service.h
@@ -12,6 +12,7 @@
 #include "chrome/browser/google_apis/auth_service_observer.h"
 #include "chrome/browser/google_apis/drive_api_url_generator.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
+#include "chrome/browser/google_apis/gdata_wapi_url_generator.h"
 
 class GURL;
 class Profile;
@@ -39,11 +40,15 @@ class DriveAPIService : public DriveServiceInterface,
   //
   // |url_request_context_getter| is used to initialize URLFetcher.
   // |base_url| is used to generate URLs for communication with the drive API.
+  // |wapi_base_url| is used to generate URLs for communication with
+  // the GData WAPI server. Note that this should only be used for the hacky
+  // workaround for the operations which is not-yet supported on Drive API v2.
   // |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 GURL& wapi_base_url,
       const std::string& custom_user_agent);
   virtual ~DriveAPIService();
 
@@ -175,6 +180,7 @@ class DriveAPIService : public DriveServiceInterface,
   scoped_ptr<OperationRunner> runner_;
   ObserverList<DriveServiceObserver> observers_;
   DriveApiUrlGenerator url_generator_;
+  GDataWapiUrlGenerator wapi_url_generator_;
   const std::string custom_user_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveAPIService);