[fsp] First part of support for reading files.

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 159 matching lines @@
       var mode = args[3];
       var create = args[4];
       var onSuccessCallback = function() {
         fileSystemProviderInternal.openFileRequestedSuccess(
             fileSystemId, requestId);
       };
       var onErrorCallback = function(error) {
         fileSystemProviderInternal.openFileRequestedError(
           fileSystemId, requestId, error);
       }
-      dispatch([fileSystemId, filePath, mode, create, onSuccessCallback,
+      dispatch([fileSystemId, requestId, filePath, mode, create,
+                onSuccessCallback, onErrorCallback]);
+    });
+
+eventBindings.registerArgumentMassager(
+    'fileSystemProvider.onCloseFileRequested',
+    function(args, dispatch) {
+      var fileSystemId = args[0];
+      var requestId = args[1];
+      var openRequestId = args[2];
+      var onSuccessCallback = function() {
+        fileSystemProviderInternal.closeFileRequestedSuccess(
+            fileSystemId, requestId);
+      };
+      var onErrorCallback = function(error) {
+        fileSystemProviderInternal.closeFileRequestedError(
+          fileSystemId, requestId, error);
+      }
+      dispatch([fileSystemId, openRequestId, openRequestId, onSuccessCallback,
                 onErrorCallback]);
     });
 
+eventBindings.registerArgumentMassager(
+    'fileSystemProvider.onReadFileRequested',
+    function(args, dispatch) {
+      var fileSystemId = args[0];
+      var requestId = args[1];
+      var openRequestId = args[2];
+      var offset = args[3];
+      var length = args[4];
+      var onSuccessCallback = function(data, hasNext) {
+        fileSystemProviderInternal.readFileRequestedSuccess(
+            fileSystemId, requestId, data, hasNext);
+      };
+      var onErrorCallback = function(error) {
+        fileSystemProviderInternal.readFileRequestedError(
+          fileSystemId, requestId, error);
+      }
+      dispatch([fileSystemId, openRequestId, offset, length, onSuccessCallback,
+                onErrorCallback]);
+    });
+
 exports.binding = binding.generate();