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 125248e43ad41a10cba9f0d919275df75e780c84..551c67a9bcadab70c65a1b09c36a08f3206187eb 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);

[lgarron, 2015/06/12 19:56:02]

If I move SecurityManager.js to security/ instead of sdk/, then the compiler
complains about this. However, removing it breaks the functionality we need.
What should I do as an alternative?

[dgozman, 2015/06/15 16:58:41]

Just don't create it here. See WebInspector.AnimationModel.fromTarget for
example.

         /** @type {!WebInspector.ResourceTreeModel} */
         this.resourceTreeModel = new WebInspector.ResourceTreeModel(this);
         /** @type {!WebInspector.NetworkLog} */