[fsp] Add the getMetadata operation.

chrome/renderer/resources/extensions/file_system_provider_custom_bindings.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Custom binding for the fileSystemProvider API.
 
 var binding = require('binding').Binding.create('fileSystemProvider');
 var fileSystemProviderInternal =
     require('binding').Binding.create('fileSystemProviderInternal').generate();
 var eventBindings = require('event_bindings');
@@ skipping 79 matching lines @@
         fileSystemProviderInternal.unmountRequestedSuccess(
             fileSystemId, requestId);
       };
       var onErrorCallback = function(error) {
         fileSystemProviderInternal.unmountRequestedError(
           fileSystemId, requestId, error);
       }
       dispatch([fileSystemId, onSuccessCallback, onErrorCallback]);
     });
 
+eventBindings.registerArgumentMassager(
+    'fileSystemProvider.onGetMetadataRequested',
+    function(args, dispatch) {
+      var fileSystemId = args[0];
+      var requestId = args[1];
+      var entryPath = args[2];
+      var onSuccessCallback = function(metadata) {
+        // Serialize the Date as a string.
+        metadata.modificationTime.value = metadata.modificationTime.toString();
+        fileSystemProviderInternal.getMetadataRequestedSuccess(
+            fileSystemId, requestId, metadata);
+      };
+      var onErrorCallback = function(error) {
+        fileSystemProviderInternal.getMetadataRequestedError(
+          fileSystemId, requestId, error);
+      }
+      dispatch([fileSystemId, entryPath, onSuccessCallback, onErrorCallback]);
+    });
+
 exports.binding = binding.generate();