New test cases for kiosk app crx file cache.

chrome/browser/extensions/updater/local_extension_cache.cc

Index: chrome/browser/extensions/updater/local_extension_cache.cc
diff --git a/chrome/browser/extensions/updater/local_extension_cache.cc b/chrome/browser/extensions/updater/local_extension_cache.cc
index b4c588f8d9e7660f1673fdc7babfc3066ee30705..b6bb926ae5adbe075997e0e5a0c3ce6b9ab12e49 100644
--- a/chrome/browser/extensions/updater/local_extension_cache.cc
+++ b/chrome/browser/extensions/updater/local_extension_cache.cc
@@ -426,8 +426,10 @@ void LocalExtensionCache::OnCacheEntryInstalled(
       callback.Run(info.file_path, true);
       return;
     }
+    it->second = info;
+  } else {
+    it = cached_extensions_.insert(std::make_pair(id, info)).first;
   }
-  it = cached_extensions_.insert(std::make_pair(id, info)).first;

[jennyz, 2014/05/09 20:08:08]

std::map won't insert the element if the key exists. Therefore, the version is
not updated in cached_extensions_ for the app with |id|. This bug is exposed
during KioskAppManagerTest::UpdateApp.

   // Time from file system can have lower precision so use precise "now".
   it->second.last_used = base::Time::Now();