New test cases for kiosk app crx file cache.

chrome/browser/chromeos/app_mode/kiosk_app_manager.cc

Index: chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc b/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
index 8b38fbf40c99d096485cbf2792e8e61e5197b265..b7ba7b615f15804c624e4f4df95d5a0f4a7d53f5 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_manager.cc
@@ -536,4 +536,10 @@ void KioskAppManager::GetKioskAppCrxCacheDir(base::FilePath* cache_dir) {
   *cache_dir = user_data_dir.AppendASCII(kCrxCacheDir);
 }
 
+bool KioskAppManager::GetKioskAppExtension(const std::string& app_id,
+                                           base::FilePath* file_path,
+                                           std::string* version) {
+  return external_cache_->GetExtension(app_id, file_path, version);
+}
+
 }  // namespace chromeos