Files.app: Add ExternalMetadataProvider class.

ui/file_manager/file_manager/foreground/js/metadata/external_metadata_provider_unittest.js

Index: ui/file_manager/file_manager/foreground/js/metadata/external_metadata_provider_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata/file_system_metadata_provider_unittest.js b/ui/file_manager/file_manager/foreground/js/metadata/external_metadata_provider_unittest.js
similarity index 52%
copy from ui/file_manager/file_manager/foreground/js/metadata/file_system_metadata_provider_unittest.js
copy to ui/file_manager/file_manager/foreground/js/metadata/external_metadata_provider_unittest.js
index b8204e15d2b24bf05b3fb8ee24cd245646e07634..2cb8e7a681c8130ccb83854f371c03449e4504d4 100644
--- a/ui/file_manager/file_manager/foreground/js/metadata/file_system_metadata_provider_unittest.js
+++ b/ui/file_manager/file_manager/foreground/js/metadata/external_metadata_provider_unittest.js
@@ -4,34 +4,45 @@
 
 var entryA = {
   toURL: function() { return "filesystem://A"; },
-  getMetadata: function(fulfill, reject) {
-    Promise.resolve({modificationTime: new Date(2015, 1, 1), size: 1024}).then(
-        fulfill, reject);
-  }
+  isFile: true
 };
 
 var entryB = {
   toURL: function() { return "filesystem://B"; },
-  getMetadata: function(fulfill, reject) {
-    Promise.resolve({modificationTime: new Date(2015, 2, 2), size: 2048}).then(
-        fulfill, reject);
-  }
+  isFile: true
 };
 
-function testFileSystemMetadataProviderBasic(callback) {
+function testExternalMetadataProviderBasic(callback) {
+  // Mocking chrome API.
+  window.chrome = {
+    fileManagerPrivate: {
+      getEntryProperties: function(urls, callback) {
+        assertEquals('filesystem://A', urls[0]);
+        assertEquals('filesystem://B', urls[1]);
+        callback([{
+          lastModifiedTime: new Date(2015, 0, 1).getTime(),
+          fileSize: 1024
+        }, {
+          lastModifiedTime: new Date(2015, 1, 2).getTime(),
+          fileSize: 2048
+        }]);
+      }
+    },
+    runtime: {lastError: null}
+  };
   var cache = new MetadataProviderCache();
-  var provider = new FileSystemMetadataProvider(cache);
+  var provider = new ExternalMetadataProvider(cache);
   reportPromise(provider.get(
       [entryA, entryB],
       ['modificationTime', 'size']).then(
           function(results) {
             assertEquals(2, results.length);
             assertEquals(
-                new Date(2015, 1, 1).toString(),
+                new Date(2015, 0, 1).toString(),
                 results[0].modificationTime.toString());
             assertEquals(1024, results[0].size);
             assertEquals(
-                new Date(2015, 2, 2).toString(),
+                new Date(2015, 1, 2).toString(),
                 results[1].modificationTime.toString());
             assertEquals(2048, results[1].size);
           }), callback);