[Selection] Add ActionRegistry

src/ui/ActionRegistry.js

@@ -0,0 +1,17 @@
+define([], function () {
+    function ActionRegistry() {
+        this.providers = [];
+    }
+
+    ActionRegistry.prototype.get = function (context) {
+        return this.providers.filter(function (provider) {
+            return provider.appliesTo(context);
+        });
+    };
+
+    ActionRegistry.prototype.addProvider = function (provider) {
+        this.providers.push(provider);
+    };
+
+    return ActionRegistry;
+});