Files.app: Add model classes to manage cache states of new MetadataCache.

chrome/browser/chromeos/file_manager/file_manager_jstest.cc

Index: chrome/browser/chromeos/file_manager/file_manager_jstest.cc
diff --git a/chrome/browser/chromeos/file_manager/file_manager_jstest.cc b/chrome/browser/chromeos/file_manager/file_manager_jstest.cc
index b9080733980c2415d881fd428bd20174cee60a53..995eddfd69cfcd511a7c80cbe7057ef50359bd73 100644
--- a/chrome/browser/chromeos/file_manager/file_manager_jstest.cc
+++ b/chrome/browser/chromeos/file_manager/file_manager_jstest.cc
@@ -124,3 +124,8 @@ IN_PROC_BROWSER_TEST_F(FileManagerJsTest, Banners) {
   RunTest(base::FilePath(
       FILE_PATH_LITERAL("foreground/js/ui/banners_unittest.html")));
 }
+
+IN_PROC_BROWSER_TEST_F(FileManagerJsTest, MetadataCacheItem) {
+  RunTest(base::FilePath(FILE_PATH_LITERAL(
+      "foreground/js/metadata/metadata_cache_item_unittest.html")));
+}