Add serialization support to the JS DataSender and DataReceiver.

extensions/renderer/resources/data_sender.js

Index: extensions/renderer/resources/data_sender.js
diff --git a/extensions/renderer/resources/data_sender.js b/extensions/renderer/resources/data_sender.js
index ee1abb33ab0b98d29639f21c8ae9098e500d2a24..8aa9ad9db90355c1e7c30b5eaaad39b04c474df0 100644
--- a/extensions/renderer/resources/data_sender.js
+++ b/extensions/renderer/resources/data_sender.js
@@ -257,10 +257,50 @@ define('data_sender', [
       this.sendsAwaitingAck_.pop().reportBytesSentAndError(
           0, this.fatalErrorValue_);
     }
-    if (this.pendingCancel_) {
-      this.pendingCancel_();
-      this.pendingCancel_ = null;
+    this.callCancelCallback_();
+  };
+
+  DataSender.prototype.serialize = function() {
+    var readyToSerialize = Promise.resolve();
+    if (this.pendingSends_.length) {
+      if (this.pendingCancel_)
+        readyToSerialize = this.cancelPromise_;
+      else
+        readyToSerialize = this.cancel(this.fatalErrorValue_);
     }
+    return readyToSerialize.then(function() {
+      this.waiter_.stop();
+      var serialized = {
+        sink: this.router_.connector_.handle_,
+        data_pipe: this.sendPipe_,
+        fatal_error_value: this.fatalErrorValue_,
+        shut_down: this.shutDown_,
+      };
+      this.router_.connector_.handle_ = null;
+      this.router_.close();
+      this.shutDown_ = true;
+      return serialized;
+    }.bind(this));
+  };
+
+  DataSender.deserialize = function(serialized) {
+    var sender = $Object.create(DataSender.prototype);
+    sender.deserialize_(serialized);
+    return sender;
+  };
+
+  DataSender.prototype.deserialize_ = function(serialized) {
+    this.sendPipe_ = serialized.data_pipe;
+    this.fatalErrorValue_ = serialized.fatal_error_value;
+    this.shutDown_ = serialized.shut_down;
+    this.router_ = new routerModule.Router(serialized.sink);
+    this.sink_ = new dataStreamMojom.DataSinkProxy(this.router_);
+    this.router_.setIncomingReceiver(this);
+    this.waiter_ = new asyncWaiter.AsyncWaiter(this.sendPipe_,
+                                               core.HANDLE_SIGNAL_WRITABLE,
+                                               this.onHandleReady_.bind(this));
+    this.pendingSends_ = [];
+    this.sendsAwaitingAck_ = [];
   };
 
   /**
@@ -301,9 +341,10 @@ define('data_sender', [
       return Promise.resolve();
 
     this.sink_.cancel(error);
-    return new Promise(function(resolve) {
+    this.cancelPromise_ = new Promise(function(resolve) {
       this.pendingCancel_ = resolve;
     }.bind(this));
+    return this.cancelPromise_;
   };
 
   /**
@@ -337,6 +378,7 @@ define('data_sender', [
    */
   DataSender.prototype.callCancelCallback_ = function() {
     if (this.pendingCancel_) {
+      this.cancelPromise_ = null;
       this.pendingCancel_();
       this.pendingCancel_ = null;
     }