Implement the feedbackPrivate API.

chrome/renderer/resources/extensions/feedback_private_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 bindings for the feedbackPrivate API.
+
+var binding = require('binding').Binding.create('feedbackPrivate');
+
+var feedbackPrivateNatives = requireNative('feedback_private');
+
+binding.registerCustomHook(function(bindingsAPI) {
+  var apiFunctions = bindingsAPI.apiFunctions;
+  apiFunctions.setUpdateArgumentsPostValidate(
+      "sendFeedback", function(feedbackInfo, callback) {
+    var attachedFileBlobUrl = '';
+    var screenshotBlobUrl = '';
+
+    if (feedbackInfo.attachedFile)
+      attachedFileBlobUrl =
+          feedbackPrivateNatives.GetBlobUrl(feedbackInfo.attachedFile.data);
+    if (feedbackInfo.screenshot)
+      screenshotBlobUrl =
+          feedbackPrivateNatives.GetBlobUrl(feedbackInfo.screenshot);
+
+    feedbackInfo.attachedFileBlobUrl = attachedFileBlobUrl;
+    feedbackInfo.screenshotBlobUrl = screenshotBlobUrl;
+
+    return [feedbackInfo, callback];
+  });
+});
+
+exports.binding = binding.generate();