1 files changed, 32 insertions, 0 deletions
diff --git a/layout/tools/layout-debug/LayoutDebugChild.jsm b/layout/tools/layout-debug/LayoutDebugChild.jsm
new file mode 100644
index 0000000000..c830188ed4
--- /dev/null
+++ b/layout/tools/layout-debug/LayoutDebugChild.jsm
@@ -0,0 +1,32 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* 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";
+
+var EXPORTED_SYMBOLS = ["LayoutDebugChild"];
+
+const NS_LAYOUT_DEBUGGINGTOOLS_CONTRACTID =
+  "@mozilla.org/layout-debug/layout-debuggingtools;1";
+
+class LayoutDebugChild extends JSWindowActorChild {
+  receiveMessage(msg) {
+    if (!this._debuggingTools) {
+      this._debuggingTools = Cc[
+        NS_LAYOUT_DEBUGGINGTOOLS_CONTRACTID
+      ].createInstance(Ci.nsILayoutDebuggingTools);
+      this._debuggingTools.init(this.contentWindow);
+    }
+    switch (msg.name) {
+      case "LayoutDebug:Call":
+        let pid = Services.appinfo.processID;
+        dump(`[${pid} ${this.contentWindow.location}]\n`);
+        this._debuggingTools[msg.data.name](msg.data.arg);
+        dump("\n");
+        break;
+      default:
+        throw `unknown message ${msg.name} sent to LayoutDebugChild`;
+    }
+    return Promise.resolve(true);
+  }
+}