Bind Window focus ability to the ExecutionContext instead of the process.

Source/modules/serviceworkers/WaitUntilObserver.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/serviceworkers/WaitUntilObserver.h"
 
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
@@ skipping 70 matching lines @@
     m_eventDispatched = true;
 }
 
 void WaitUntilObserver::waitUntil(ScriptState* scriptState, const ScriptValue& value, ExceptionState& exceptionState)
 {
     if (m_eventDispatched) {
         exceptionState.throwDOMException(InvalidStateError, "The event handler is already finished.");
         return;
     }
 
+    if (!executionContext())
+        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();
+
     incrementPendingActivity();
     ScriptPromise::cast(scriptState, value).then(
         ThenFunction::createFunction(scriptState, this, ThenFunction::Fulfilled),
         ThenFunction::createFunction(scriptState, this, ThenFunction::Rejected));
 }
 
 WaitUntilObserver::WaitUntilObserver(ExecutionContext* context, EventType type, int eventID)
     : ContextLifecycleObserver(context)
     , m_type(type)
     , m_eventID(eventID)
@@ skipping 26 matching lines @@
     WebServiceWorkerEventResult result = m_hasError ? WebServiceWorkerEventResultRejected : WebServiceWorkerEventResultCompleted;
     switch (m_type) {
     case Activate:
         client->didHandleActivateEvent(m_eventID, result);
         break;
     case Install:
         client->didHandleInstallEvent(m_eventID, result);
         break;
     case NotificationClick:
         client->didHandleNotificationClickEvent(m_eventID, result);
+        executionContext()->consumeWindowFocus();
         break;
     case Push:
         client->didHandlePushEvent(m_eventID, result);
         break;
     }
     observeContext(0);
 }
 
 } // namespace blink