drive: Enable recursive fast-fetch.

chrome/browser/drive/fake_drive_service.cc

Index: chrome/browser/drive/fake_drive_service.cc
diff --git a/chrome/browser/drive/fake_drive_service.cc b/chrome/browser/drive/fake_drive_service.cc
index 8629ae7f626fb77a2646a89b5db5a42e977f0466..2365ac15b4e9d16cbdc4ab24bd917de931ff5e3c 100644
--- a/chrome/browser/drive/fake_drive_service.cc
+++ b/chrome/browser/drive/fake_drive_service.cc
@@ -176,7 +176,9 @@ FakeDriveService::FakeDriveService()
       directory_load_count_(0),
       about_resource_load_count_(0),
       app_list_load_count_(0),
-      offline_(false) {
+      blocked_resource_list_load_count_(0),
+      offline_(false),
+      never_return_all_resource_list_(false) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
@@ -328,6 +330,11 @@ CancelCallback FakeDriveService::GetAllResourceList(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
+  if (never_return_all_resource_list_) {
+    ++blocked_resource_list_load_count_;
+    return CancelCallback();
+  }
+
   GetResourceListInternal(0,  // start changestamp
                           std::string(),  // empty search query
                           std::string(),  // no directory resource id,