Add a minimal Security panel to DevTools (behind a hidden experiment).

Source/devtools/front_end/sdk/Target.js

Index: Source/devtools/front_end/sdk/Target.js
diff --git a/Source/devtools/front_end/sdk/Target.js b/Source/devtools/front_end/sdk/Target.js
index 4e759e4495fb1def93f1a647108fb0e1bed01ddd..648f61c8f1a40693f0d2cb2971fbdf18e2b1a25f 100644
--- a/Source/devtools/front_end/sdk/Target.js
+++ b/Source/devtools/front_end/sdk/Target.js
@@ -112,6 +112,8 @@ WebInspector.Target.prototype = {
         this.consoleModel = new WebInspector.ConsoleModel(this);
         /** @type {!WebInspector.NetworkManager} */
         this.networkManager = new WebInspector.NetworkManager(this);
+        /** @type {!WebInspector.SecurityManager} */
+        this.securityManager = new WebInspector.SecurityManager(this);
         /** @type {!WebInspector.ResourceTreeModel} */
         this.resourceTreeModel = new WebInspector.ResourceTreeModel(this);
         /** @type {!WebInspector.NetworkLog} */