[4/5 blink] Shows the clients which are controlled by ServiceWorker in DevTools.

LayoutTests/http/tests/inspector/service-workers/service-workers-test.js

 var initialize_ServiceWorkersTest = function() {
 
 InspectorTest.registerServiceWorker = function(script, scope)
 {
     return InspectorTest.invokePageFunctionPromise("registerServiceWorker", [script, scope]);
 }
 
 InspectorTest.unregisterServiceWorker = function(scope)
 {
     return InspectorTest.invokePageFunctionPromise("unregisterServiceWorker", [scope]);
 }
 
 InspectorTest.postToServiceWorker = function(scope, message)
 {
     return InspectorTest.invokePageFunctionPromise("postToServiceWorker", [scope, message]);
 }
 
 function replaceInnerTextAll(rootElement, selectors, replacementString)
 {
     var elements = rootElement.querySelectorAll(selectors);
     for (var i = 0; i < elements.length; i++)
         elements[i].innerText = replacementString;
 }
 
 function modifyTestUnfriendlyText(rootElement)
 {
     replaceInnerTextAll(rootElement, ".service-worker-script-last-modified", "LAST-MODIFIED");
     replaceInnerTextAll(rootElement, ".service-worker-script-response-time", "RESPONSE-TIME");
+    replaceInnerTextAll(rootElement, ".service-worker-client", "CLIENT");
 }
 
 InspectorTest.dumpServiceWorkersView = function(scopes)
 {
     var swView = WebInspector.panels.resources.visibleView;
     modifyTestUnfriendlyText(swView._root);
     var results = [];
     var expectedTitles = scopes.map(function(scope) {return "Scope: " + (new URL(scope).pathname)});
     results.push("==== ServiceWorkersView ====");
     results.push(swView._root.querySelector(".service-workers-origin-title").innerText);
@@ skipping 46 matching lines @@
     var registration = registrations[scope];
     if (!registration) {
         reject("ServiceWorker for " + scope + " is not registered");
         return;
     }
     registration.unregister().then(function() {
             delete registrations[scope];
             resolve();
         }, reject);
 }