service worker: Implement NavigationPreloadManager.getState

third_party/WebKit/Source/modules/serviceworkers/NavigationPreloadManager.cpp

 // Copyright 2016 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 "modules/serviceworkers/NavigationPreloadManager.h"
 
 #include "core/dom/DOMException.h"
 #include "modules/serviceworkers/NavigationPreloadCallbacks.h"
 #include "modules/serviceworkers/ServiceWorkerContainerClient.h"
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 
 namespace blink {
 
 ScriptPromise NavigationPreloadManager::enable(ScriptState* scriptState) {
   return setEnabled(true, scriptState);
 }
 
 ScriptPromise NavigationPreloadManager::disable(ScriptState* scriptState) {
   return setEnabled(false, scriptState);
 }
 
 ScriptPromise NavigationPreloadManager::setHeaderValue(ScriptState*,
                                                        const String& value) {
   NOTIMPLEMENTED();
   return ScriptPromise();
 }
 
-ScriptPromise NavigationPreloadManager::getState(ScriptState*) {
-  NOTIMPLEMENTED();
-  return ScriptPromise();
+ScriptPromise NavigationPreloadManager::getState(ScriptState* scriptState) {
+  ServiceWorkerContainerClient* client =
+      ServiceWorkerContainerClient::from(m_registration->getExecutionContext());
+  if (!client || !client->provider()) {
+    return ScriptPromise::rejectWithDOMException(
+        scriptState, DOMException::create(InvalidStateError, "No provider."));
+  }
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+  ScriptPromise promise = resolver->promise();
+  m_registration->webRegistration()->getNavigationPreloadState(
+      client->provider(),
+      wrapUnique(new GetNavigationPreloadStateCallbacks(resolver)));
+  return promise;
 }
 
 NavigationPreloadManager::NavigationPreloadManager(
     ServiceWorkerRegistration* registration)
     : m_registration(registration) {}
 
 ScriptPromise NavigationPreloadManager::setEnabled(bool enable,
                                                    ScriptState* scriptState) {
   ServiceWorkerContainerClient* client =
       ServiceWorkerContainerClient::from(m_registration->getExecutionContext());
   if (!client || !client->provider()) {
     return ScriptPromise::rejectWithDOMException(
         scriptState, DOMException::create(InvalidStateError, "No provider."));
   }
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
   ScriptPromise promise = resolver->promise();
   m_registration->webRegistration()->enableNavigationPreload(
       enable, client->provider(),
       wrapUnique(new EnableNavigationPreloadCallbacks(resolver)));
   return promise;
 }
 
 DEFINE_TRACE(NavigationPreloadManager) {
   visitor->trace(m_registration);
 }
 
 }  // namespace blink