Add serialization support to the JS DataSender and DataReceiver.

extensions/renderer/resources/data_receiver.js

 // Copyright 2014 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.
 
 define('data_receiver', [
     'async_waiter',
     'device/serial/data_stream.mojom',
+    'device/serial/data_stream_serialization.mojom',
     'mojo/public/js/bindings/core',
     'mojo/public/js/bindings/router',
-], function(asyncWaiter, dataStream, core, router) {
+], function(asyncWaiter, dataStream, serialization, core, router) {
   /**
    * @module data_receiver
    */
 
   /**
    * @typedef module:data_receiver~PendingError
    * @type {Object}
    * @property {number} error - the error
    * @property {number} offset - the location of the error
    * @private
@@ skipping 165 matching lines @@
     this.router_.close();
     this.waiter_.stop();
     core.close(this.receivePipe_);
     if (this.receive_) {
       this.receive_.dispatchFatalError(this.fatalErrorValue_);
       this.receive_ = null;
     }
   };
 
   /**
+   * Serializes this DataReceiver.
+   * @return {Promise.<?SerializedDataReceiver>} The serialization of this

[raymes, 2014/09/18 03:16:06]

Well really it returns a promise that resolves to that?

[Sam McNally, 2014/09/19 04:58:46]

Done.

+   *     DataReceiver. If this DataReceiver has shut down, this will return
+   *     null.
+   */
+  DataReceiver.prototype.serialize = function() {
+    if (this.shutDown_)
+      return Promise.resolve(null);

[raymes, 2014/09/18 03:16:06]

How come you decided to return null in this case rather than serializing the
shutDown state as well?

[Sam McNally, 2014/09/19 04:58:46]

None of the other state is useful after shutdown.

+
+    this.waiter_.stop();
+    if (this.receive_) {
+      this.receive_.dispatchFatalError(this.fatalErrorValue_);
+      this.receive_ = null;
+    }
+    var serialized = new serialization.SerializedDataReceiver();
+    serialized.source = this.router_.connector_.handle_;
+    serialized.data_pipe = this.receivePipe_;
+    serialized.fatal_error_value = this.fatalErrorValue_;
+    serialized.bytes_received = this.bytesReceived_;
+    serialized.paused = this.paused_;
+    this.router_.connector_.handle_ = null;
+    this.router_.close();
+    this.shutDown_ = true;
+    return Promise.resolve(serialized);
+  };
+
+  /**
+   * Deserializes a SerializedDataReceiver.
+   * @param {?SerializedDataReceiver} serialized The serialized DataReceiver.
+   * @return {DataReceiver} The deserialized DataReceiver.
+   */
+  DataReceiver.deserialize = function(serialized) {
+    var receiver = $Object.create(DataReceiver.prototype);
+    receiver.deserialize_(serialized);
+    return receiver;
+  };
+
+  /**
+   * Deserializes a SerializedDataReceiver into this DataReceiver.
+   * @param {?SerializedDataReceiver} serialized The serialized DataReceiver.
+   * @private
+   */
+  DataReceiver.prototype.deserialize_ = function(serialized) {
+    if (!serialized) {
+      this.shutDown_ = true;
+      return;
+    }
+    this.receivePipe_ = serialized.data_pipe;
+    this.fatalErrorValue_ = serialized.fatal_error_value;
+    this.bytesReceived_ = serialized.bytes_received;
+    this.paused_ = serialized.paused;
+    this.shutDown_ = false;
+    this.router_ = new router.Router(serialized.source);
+    this.router_.setIncomingReceiver(this);
+    this.source_ = new dataStream.DataSourceProxy(this.router_);
+    this.waiter_ = new asyncWaiter.AsyncWaiter(this.receivePipe_,
+                                               core.HANDLE_SIGNAL_READABLE,
+                                               this.onHandleReady_.bind(this));
+  };
+
+  /**
    * Receive data from the DataSource.
    * @return {Promise.<ArrayBuffer>} A promise to the received data. If an error
    *     occurs, the promise will reject with an Error object with a property
    *     error containing the error code.
    * @throws Will throw if this has encountered a fatal error or another receive
    *     is in progress.
    */
   DataReceiver.prototype.receive = function() {
     if (this.shutDown_)
-      throw new Error('System error');
+      throw new Error('DataReceiver has been closed');
     if (this.receive_)
       throw new Error('Receive already in progress.');
     var receive = new PendingReceive();
     var promise = receive.getPromise();
     if (this.pendingError_ &&
         receive.dispatchError(this.pendingError_, this.bytesReceived_)) {
       this.pendingError_ = null;
       this.paused_ = true;
       return promise;
     }
@@ skipping 52 matching lines @@
       this.receive_ = null;
       this.waiter_.stop();
       this.paused_ = true;
       return;
     }
     this.pendingError_ = pendingError;
   };
 
   return {DataReceiver: DataReceiver};
 });