Add blink-side binding code for navigator.serviceWorker.current

Test code is basically copied from falken@'s:
https://github.com/mattto/ServiceWorker/tree/master/examples/layout-tests
(minus one obsolete FIXME, plus another FIXME)

BUG=366538
TEST=http/tests/serviceworker/current-on-load.html
TEST=http/tests/serviceworker/current-on-reload.html

Review URL: https://codereview.chromium.org/265943003

git-svn-id: svn://svn.chromium.org/blink/trunk@173716 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-properties-after-frame-navigated-expected.txt

@@ -49,6 +49,7 @@ PASS window.cached_navigator_battery.onchargingchange is null
 PASS window.cached_navigator_battery.onchargingtimechange is null
 PASS window.cached_navigator_battery.ondischargingtimechange is null
 PASS window.cached_navigator_battery.onlevelchange is null
+PASS window.cached_navigator_serviceWorker.current is null
 PASS window.cached_performance.onwebkitresourcetimingbufferfull is null
 PASS window.cached_performance_navigation.redirectCount is 0
 PASS window.cached_performance_navigation.type is 0

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-properties-after-frame-removed-and-gced-expected.txt

@@ -49,6 +49,7 @@ PASS window.cached_navigator_battery.onchargingchange is null
 PASS window.cached_navigator_battery.onchargingtimechange is null
 PASS window.cached_navigator_battery.ondischargingtimechange is null
 PASS window.cached_navigator_battery.onlevelchange is null
+PASS window.cached_navigator_serviceWorker.current is null
 PASS window.cached_performance.onwebkitresourcetimingbufferfull is null
 PASS window.cached_performance_navigation.redirectCount is 0
 PASS window.cached_performance_navigation.type is 0

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-properties-after-frame-removed-expected.txt

@@ -49,6 +49,7 @@ PASS window.cached_navigator_battery.onchargingchange is null
 PASS window.cached_navigator_battery.onchargingtimechange is null
 PASS window.cached_navigator_battery.ondischargingtimechange is null
 PASS window.cached_navigator_battery.onlevelchange is null
+PASS window.cached_navigator_serviceWorker.current is null
 PASS window.cached_performance.onwebkitresourcetimingbufferfull is null
 PASS window.cached_performance_navigation.redirectCount is 0
 PASS window.cached_performance_navigation.type is 0

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt

@@ -56,6 +56,7 @@ PASS oldChildWindow.navigator.onLine is newChildWindow.navigator.onLine
 PASS oldChildWindow.navigator.platform is newChildWindow.navigator.platform
 PASS oldChildWindow.navigator.product is newChildWindow.navigator.product
 PASS oldChildWindow.navigator.productSub is newChildWindow.navigator.productSub
+PASS oldChildWindow.navigator.serviceWorker.current is newChildWindow.navigator.serviceWorker.current
 PASS oldChildWindow.navigator.userAgent is newChildWindow.navigator.userAgent
 PASS oldChildWindow.navigator.vendor is newChildWindow.navigator.vendor
 PASS oldChildWindow.navigator.vendorSub is newChildWindow.navigator.vendorSub

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt

@@ -56,6 +56,7 @@ PASS childWindow.navigator.onLine is window.navigator.onLine
 PASS childWindow.navigator.platform is window.navigator.platform
 PASS childWindow.navigator.product is window.navigator.product
 PASS childWindow.navigator.productSub is window.navigator.productSub
+FAIL childWindow.navigator.serviceWorker.current should be null. Threw exception TypeError: Cannot read property 'current' of null
 PASS childWindow.navigator.userAgent is ''
 PASS childWindow.navigator.vendor is window.navigator.vendor
 PASS childWindow.navigator.vendorSub is ''

third_party/WebKit/LayoutTests/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt

@@ -55,6 +55,7 @@ PASS childWindow.navigator.onLine is window.navigator.onLine
 PASS childWindow.navigator.platform is window.navigator.platform
 PASS childWindow.navigator.product is window.navigator.product
 PASS childWindow.navigator.productSub is window.navigator.productSub
+PASS childWindow.navigator.serviceWorker.current is null
 PASS childWindow.navigator.userAgent is ''
 PASS childWindow.navigator.vendor is window.navigator.vendor
 PASS childWindow.navigator.vendorSub is ''

third_party/WebKit/LayoutTests/http/tests/serviceworker/current-on-load-expected.txt

+
+FAIL current is set for a controlled document assert_unreached: Unregister should not fail: NotSupportedError Reached unreachable code
+

third_party/WebKit/LayoutTests/http/tests/serviceworker/current-on-load.html

+<!DOCTYPE html>
+<title>Service Worker: Current on load</title>
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+<script src="resources/test-helpers.js"></script>
+<body>
+<script>
+var t = async_test('current is set for a controlled document');
+t.step(function() {
+    var scope = 'resources/blank.html'
+    navigator.serviceWorker.unregister(scope).then(
+        doTest,
+        unreached_rejection(t, 'Unregister should not fail')
+    );
+
+    function doTest() {
+        navigator.serviceWorker.register(
+            'resources/worker-no-op.js', {scope: scope}
+        ).then(
+            onRegister,
+            unreached_rejection(t, 'Registration should succeed, but failed')
+        );
+    }
+
+    function onRegister(worker) {
+        worker.addEventListener('statechange', t.step_func(function(event) {
+            if (event.target.state == 'active')
+                onActive();
+        }));
+    }
+
+    function onActive() {
+        with_iframe(scope, t.step_func(function(frame) {
+            var w = frame.contentWindow;
+            assert_true(w.navigator.serviceWorker.current instanceof w.ServiceWorker,
+                        'current should be a ServiceWorker object');
+            t.done();
+        }));
+    }
+});
+</script>
+</body>

third_party/WebKit/LayoutTests/http/tests/serviceworker/current-on-reload-expected.txt

+
+FAIL current is set upon reload after registration assert_unreached: Unregister should not fail: NotSupportedError Reached unreachable code
+

third_party/WebKit/LayoutTests/http/tests/serviceworker/current-on-reload.html

+<!DOCTYPE html>
+<title>Service Worker: Current on reload</title>
+<script src="../resources/testharness.js"></script>
+<script src="../resources/testharnessreport.js"></script>
+<script src="resources/test-helpers.js"></script>
+<script src="resources/testutils.js"></script>
+<body>
+<script>
+var t = async_test('current is set upon reload after registration');
+t.step(function() {
+    var reloaded = false;
+    var scope = 'resources/blank.html';
+    navigator.serviceWorker.unregister(scope).then(
+        doTest,
+        unreached_rejection(t, 'Unregister should not fail')
+    );
+
+    function doTest() {
+        with_iframe(scope, t.step_func(onIframeLoad));
+    }
+
+    function onIframeLoad(frame) {
+        var w = frame.contentWindow;
+
+        function onActive(event) {
+           assert_equals(w.navigator.serviceWorker.current, null,
+                         'current should be null until the document is reloaded');
+           reloaded = true;
+           w.location.reload();
+        }
+
+        function onRegister(worker) {
+            worker.addEventListener('statechange', t.step_func(function(event) {
+                if (event.target.state == 'active')
+                    onActive();
+            }));
+        }
+
+        if (reloaded) {
+            assert_true(w.navigator.serviceWorker.current instanceof w.ServiceWorker,
+                        'current should be a ServiceWorker object upon reload');
+            t.done();
+            return;
+        }
+
+        w.navigator.serviceWorker.register(
+            'worker-no-op.js', {scope: 'blank.html'}
+        ).then(
+            t.step_func(onRegister),
+            unreached_rejection(t, 'Registration should succeed, but failed')
+        );
+    }
+});
+</script>
+</body>

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/test-helpers.js

@@ -10,9 +10,8 @@ function service_worker_test(url, description) {
                 messageChannel.port1.onmessage = t.step_func(onMessage);
                 worker.postMessage({port:messageChannel.port2}, [messageChannel.port2]);
             }),
-            t.step_func(function(reason) {
-                assert_unreached('Registration should succeed, but failed: ' + reason.name);
-            }));
+            unreached_rejection(t, 'Registration should succeed, but failed')
+        );
 
         function onMessage(e) {
             assert_equals(e.data, 'pass');
@@ -38,3 +37,13 @@ function unreached_rejection(test, prefix) {
         assert_unreached(prefix + ': ' + reason.name);
     });
 }
+
+// FIXME: Clean up the iframe when the test completes.
+function with_iframe(url, f) {
+  var frame = document.createElement('iframe');
+  frame.src = url;
+  frame.onload = function() {
+      f(frame);
+  };
+  document.body.appendChild(frame);
+}

third_party/WebKit/LayoutTests/virtual/serviceworker/http/tests/serviceworker/current-on-load-expected.txt

+
+
+PASS current is set for a controlled document 
+

third_party/WebKit/LayoutTests/virtual/serviceworker/http/tests/serviceworker/current-on-reload-expected.txt

+
+
+PASS current is set upon reload after registration 
+

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerContainer.h

@@ -35,6 +35,7 @@
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/frame/DOMWindowLifecycleObserver.h"
+#include "modules/serviceworkers/ServiceWorker.h"
 #include "public/platform/WebServiceWorkerProviderClient.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
@@ -66,6 +67,8 @@ public:
     ScriptPromise registerServiceWorker(ExecutionContext*, const String& pattern, const Dictionary&);
     ScriptPromise unregisterServiceWorker(ExecutionContext*, const String& scope = String());
 
+    PassRefPtr<ServiceWorker> current() { return m_current; }
+
     // WebServiceWorkerProviderClient overrides.
     virtual void setCurrentServiceWorker(blink::WebServiceWorker*) OVERRIDE;
     virtual void dispatchMessageEvent(const blink::WebString& message, const blink::WebMessagePortChannelArray&) OVERRIDE;

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerContainer.idl

@@ -33,4 +33,6 @@
 ] interface ServiceWorkerContainer {
     [CallWith=ExecutionContext, ImplementedAs=registerServiceWorker] Promise register(DOMString url, optional Dictionary options);
     [CallWith=ExecutionContext, ImplementedAs=unregisterServiceWorker] Promise unregister(optional DOMString scope);
+
+    readonly attribute ServiceWorker current;
 };