DevTools: [Persistence] validate persistence binding.

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-test.js

 var initialize_PersistenceTest = function() {
 
 InspectorTest.preloadModule("persistence");
 InspectorTest.preloadModule("sources");
 
+Runtime.experiments.enableForTest("persistenceValidation");
+
 Persistence.PersistenceBinding.prototype.toString = function()
 {
     var lines = [
         "{",
         "       network: " + this.network.url(),
         "    fileSystem: " + this.fileSystem.url(),
         "    exactMatch: " + this.exactMatch,
         "}"
     ];
     return lines.join("\n");
@@ skipping 50 matching lines @@
         return uiSourceCode.name() === name && uiSourceCode.project().type() === projectType;
     }
 }
 
 InspectorTest.addFooJSFile = function(fs)
 {
     return fs.root.mkdir("inspector").mkdir("persistence").mkdir("resources").addFile("foo.js", "\n\nwindow.foo = ()=>'foo';");
 }
 
 }