service worker: Add promise boilerplate for NavigationPreload enable/disable

content/child/service_worker/web_service_worker_registration_impl.cc

Index: content/child/service_worker/web_service_worker_registration_impl.cc
diff --git a/content/child/service_worker/web_service_worker_registration_impl.cc b/content/child/service_worker/web_service_worker_registration_impl.cc
index ae2705ee0b568eb48704764e0a591b0f0746cd49..55739647369bc44460ab2660f5e2c7b88a381879 100644
--- a/content/child/service_worker/web_service_worker_registration_impl.cc
+++ b/content/child/service_worker/web_service_worker_registration_impl.cc
@@ -13,6 +13,7 @@
 #include "content/child/service_worker/web_service_worker_impl.h"
 #include "content/child/service_worker/web_service_worker_provider_impl.h"
 #include "content/common/service_worker/service_worker_types.h"
+#include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerError.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerRegistrationProxy.h"
 
 namespace content {
@@ -145,6 +146,20 @@ void WebServiceWorkerRegistrationImpl::unregister(
                                       registration_id(), callbacks);
 }
 
+void WebServiceWorkerRegistrationImpl::enableNavigationPreload(
+    WebEnableNavigationPreloadCallbacks* callbacks) {
+  // TODO(falken): Implement this.

[horo, 2016/10/13 07:36:06]

std::unique_ptr<WebEnableNavigationPreloadCallbacks> callback(callbacks);

|callbacks| need to be deleted.

[falken, 2016/10/13 07:45:56]

Done.

+  callbacks->onError(blink::WebServiceWorkerError(
+      blink::WebServiceWorkerError::ErrorTypeAbort, "Not implemented"));
+}
+
+void WebServiceWorkerRegistrationImpl::disableNavigationPreload(
+    WebEnableNavigationPreloadCallbacks* callbacks) {

[horo, 2016/10/13 07:36:06]

WebDisableNavigationPreloadCallbacks

[falken, 2016/10/13 07:45:56]

Done.

+  // TODO(falken): Implement this.

[horo, 2016/10/13 07:36:06]

std::unique_ptr<WebDisableNavigationPreloadCallbacks> callback(callbacks);

|callbacks| need to be deleted.

[falken, 2016/10/13 07:45:55]

Done.

+  callbacks->onError(blink::WebServiceWorkerError(
+      blink::WebServiceWorkerError::ErrorTypeAbort, "Not implemented"));
+}
+
 int64_t WebServiceWorkerRegistrationImpl::registration_id() const {
   return handle_ref_->registration_id();
 }