drive: Stop making multiple GetAppList() requests from DriveAppRegistry

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 80816f475a55d3bab5b528287eed6c899979b2bc..1729966d6431ba78f751bfc5a653c3cc2f8fb9c3 100644
--- a/chrome/browser/drive/fake_drive_service.cc
+++ b/chrome/browser/drive/fake_drive_service.cc
@@ -165,6 +165,7 @@ FakeDriveService::FakeDriveService()
       change_list_load_count_(0),
       directory_load_count_(0),
       about_resource_load_count_(0),
+      app_list_load_count_(0),
       offline_(false) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
@@ -551,6 +552,7 @@ CancelCallback FakeDriveService::GetAppList(
     return CancelCallback();
   }
 
+  ++app_list_load_count_;
   scoped_ptr<AppList> app_list(AppList::CreateFrom(*app_info_value_));
   base::MessageLoop::current()->PostTask(
       FROM_HERE,