Add GetChangelist operation for Drive V2.

chrome/browser/chromeos/gdata/gdata_documents_service.cc

Index: chrome/browser/chromeos/gdata/gdata_documents_service.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_documents_service.cc b/chrome/browser/chromeos/gdata/gdata_documents_service.cc
index 7f1f27e26b6c1e95fca1eae17d992baefee90a24..55b93045f61acb269b4c97a63680ce59d4015e54 100644
--- a/chrome/browser/chromeos/gdata/gdata_documents_service.cc
+++ b/chrome/browser/chromeos/gdata/gdata_documents_service.cc
@@ -108,7 +108,22 @@ void DocumentsService::GetDocuments(const GURL& url,
                                 directory_resource_id,
                                 callback);
   if (!url.is_empty())
-    operation->SetUrl(url);
+    operation->SetURL(url);
+  runner_->StartOperationWithRetry(operation);
+}
+
+void DocumentsService::GetChangelist(const GURL& url,
+                                     int64 start_changestamp,
+                                     const GetDataCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  VLOG(1) << "GetChangeList: start_changestamp = " << start_changestamp;
+
+  GetChangelistOperation* operation =
+      new GetChangelistOperation(operation_registry(),
+                                 start_changestamp,
+                                 callback);
+  if (!url.is_empty())
+    operation->SetURL(url);
   runner_->StartOperationWithRetry(operation);
 }