Add a minimal Security panel to DevTools (behind a hidden 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 141bfb5edbc8a3d1962681734375eef270a139d7..4135460129e6588b5ca6b6e5763777603341ff86 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -139,6 +139,7 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("networkRequestsOnTimeline", "Network requests on Timeline");
         Runtime.experiments.register("privateScriptInspection", "Private script inspection");
         Runtime.experiments.register("promiseTracker", "Promise inspector");
+        Runtime.experiments.register("securityPanel", "Security panel", true);
         Runtime.experiments.register("serviceWorkersInPageFrontend", "Service workers in DevTools for page");
         Runtime.experiments.register("serviceWorkersInResources", "Service workers in Resources panel", true);
         Runtime.experiments.register("showPrimaryLoadWaterfallInNetworkTimeline", "Show primary load waterfall in Network timeline", true);