Devtools: Create layout editor experiment

Source/devtools/front_end/main/Main.js

Index: Source/devtools/front_end/main/Main.js
diff --git a/Source/devtools/front_end/main/Main.js b/Source/devtools/front_end/main/Main.js
index 42d383134850b92162eeb0af126c86b4f3405b36..624116ecde7f4becc63b14e6c637d2920cb9fb3f 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -131,8 +131,9 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("fileSystemInspection", "FileSystem inspection");
         Runtime.experiments.register("filmStripInNetworkAndTimeline", "Filmstrip in Network and Timeline Panel", true);
         Runtime.experiments.register("gpuTimeline", "GPU data on timeline", true);
-        Runtime.experiments.register("inputEventsOnTimelineOverview", "Input events on Timeline overview", true)
+        Runtime.experiments.register("inputEventsOnTimelineOverview", "Input events on Timeline overview", true);
         Runtime.experiments.register("layersPanel", "Layers panel");
+        Runtime.experiments.register("layoutEditor", "Layout editor", true);
         Runtime.experiments.register("materialDesign", "Material design");
         Runtime.experiments.register("networkRequestHeadersFilterInDetailsView", "Network request headers filter in details view", true);
         Runtime.experiments.register("networkRequestsOnTimeline", "Network requests on Timeline");