import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/shared/fronts/reflow.js

@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {reflowSpec} = require("devtools/shared/specs/reflow");
+const protocol = require("devtools/shared/protocol");
+
+/**
+ * Usage example of the reflow front:
+ *
+ * let front = ReflowFront(toolbox.target.client, toolbox.target.form);
+ * front.on("reflows", this._onReflows);
+ * front.start();
+ * // now wait for events to come
+ */
+const ReflowFront = protocol.FrontClassWithSpec(reflowSpec, {
+  initialize: function (client, {reflowActor}) {
+    protocol.Front.prototype.initialize.call(this, client, {actor: reflowActor});
+    this.manage(this);
+  },
+
+  destroy: function () {
+    protocol.Front.prototype.destroy.call(this);
+  },
+});
+
+exports.ReflowFront = ReflowFront;