Allow creating new windows from a notificationclick event in SW.

Source/modules/serviceworkers/WaitUntilObserver.cpp

Index: Source/modules/serviceworkers/WaitUntilObserver.cpp
diff --git a/Source/modules/serviceworkers/WaitUntilObserver.cpp b/Source/modules/serviceworkers/WaitUntilObserver.cpp
index 55a289762c41b04b169f44c82d53ba69c9955492..bf4ed4e459ed914644c38adc2f24df6041e8e076 100644
--- a/Source/modules/serviceworkers/WaitUntilObserver.cpp
+++ b/Source/modules/serviceworkers/WaitUntilObserver.cpp
@@ -92,11 +92,13 @@ void WaitUntilObserver::waitUntil(ScriptState* scriptState, const ScriptValue& v
         return;
 
     // When handling a notificationclick event, we want to allow one window to
-    // be focused. Regardless of whether one window was focused,
-    // |consumeWindowFocus| will be called when all the pending activities will
-    // be resolved.
-    if (m_type == NotificationClick)
-        executionContext()->allowWindowFocus();
+    // be focused or opened. Regardless of whether such action happened,
+    // |consumeWindowInteraction| will be called when all the pending activities
+    // will be resolved or after a
+    if (m_type == NotificationClick) {
+        executionContext()->allowWindowInteraction();
+        m_consumeWindowInteractionTimer.startOneShot(ServiceWorkerGlobalScope::kWindowInteractionTimeout, FROM_HERE);
+    }
 
     incrementPendingActivity();
     ScriptPromise::cast(scriptState, value).then(
@@ -111,6 +113,7 @@ WaitUntilObserver::WaitUntilObserver(ExecutionContext* context, EventType type,
     , m_pendingActivity(0)
     , m_hasError(false)
     , m_eventDispatched(false)
+    , m_consumeWindowInteractionTimer(this, &WaitUntilObserver::consumeWindowInteraction)
 {
 }
 
@@ -144,7 +147,8 @@ void WaitUntilObserver::decrementPendingActivity()
         break;
     case NotificationClick:
         client->didHandleNotificationClickEvent(m_eventID, result);
-        executionContext()->consumeWindowFocus();
+        m_consumeWindowInteractionTimer.stop();
+        consumeWindowInteraction(nullptr);
         break;
     case Push:
         client->didHandlePushEvent(m_eventID, result);
@@ -153,6 +157,13 @@ void WaitUntilObserver::decrementPendingActivity()
     observeContext(0);
 }
 
+void WaitUntilObserver::consumeWindowInteraction(Timer<WaitUntilObserver>*)
+{
+    if (!executionContext())
+        return;
+    executionContext()->consumeWindowInteraction();
+}
+
 void WaitUntilObserver::trace(Visitor* visitor)
 {
     ContextLifecycleObserver::trace(visitor);