Add request header on gdata operation for testing ETag match.

chrome/browser/google_apis/gdata_wapi_service.cc

Index: chrome/browser/google_apis/gdata_wapi_service.cc
diff --git a/chrome/browser/google_apis/gdata_wapi_service.cc b/chrome/browser/google_apis/gdata_wapi_service.cc
index 02ee8beba7da4e5745b28d74a693b82497f32e90..19a50b95b5287c58a3198c87d6e36279f5cac123 100644
--- a/chrome/browser/google_apis/gdata_wapi_service.cc
+++ b/chrome/browser/google_apis/gdata_wapi_service.cc
@@ -185,6 +185,7 @@ void GDataWapiService::DownloadDocument(
     const FilePath& local_cache_path,
     const GURL& document_url,
     DocumentExportFormat format,
+    const std::string& etag,
     const gdata::DownloadActionCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ -194,6 +195,7 @@ void GDataWapiService::DownloadDocument(
       chrome_common_net::AppendQueryParameter(document_url,
                                               "exportFormat",
                                               GetExportFormatParam(format)),
+      etag,
       callback,
       gdata::GetContentCallback());
 }
@@ -202,6 +204,7 @@ void GDataWapiService::DownloadFile(
     const FilePath& virtual_path,
     const FilePath& local_cache_path,
     const GURL& document_url,
+    const std::string& etag,
     const gdata::DownloadActionCallback& download_action_callback,
     const gdata::GetContentCallback& get_content_callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ -210,17 +213,19 @@ void GDataWapiService::DownloadFile(
       new gdata::DownloadFileOperation(operation_registry(),
                                        download_action_callback,
                                        get_content_callback, document_url,
-                                       virtual_path, local_cache_path));
+                                       virtual_path, local_cache_path,
+                                       etag));
 }
 
 void GDataWapiService::DeleteDocument(
     const GURL& document_url,
+    const std::string& etag,
     const gdata::EntryActionCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   runner_->StartOperationWithRetry(
       new gdata::DeleteDocumentOperation(operation_registry(), callback,
-                                         document_url));
+                                         document_url, etag));
 }
 
 void GDataWapiService::CreateDirectory(