Service Worker: Add Clients.get(id)

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

Index: third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerClients.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerClients.cpp b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerClients.cpp
index ff907d2e33cf8a5dcc584a4ca7a8d8ed251671e4..8b55a4ed59e424c5a07a061bab42973a59f532b9 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerClients.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerClients.cpp
@@ -71,6 +71,21 @@ ServiceWorkerClients::ServiceWorkerClients()
 {
 }
 
+ScriptPromise ServiceWorkerClients::get(ScriptState* scriptState, const String& id)
+{
+    ExecutionContext* executionContext = scriptState->executionContext();
+    // FIXME: May be null due to worker termination: http://crbug.com/413518.
+    if (!executionContext)
+        return ScriptPromise();
+
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromise promise = resolver->promise();
+
+    // TODO(jungkees): Use ServiceWorkerClient for typename S of CallBackPromiseAdpater.

[zino, 2016/01/04 09:05:27]

I'm not sure but you are already done?

+    ServiceWorkerGlobalScopeClient::from(executionContext)->getClient(id, new CallbackPromiseAdapter<ServiceWorkerClient, ServiceWorkerError>(resolver));
+    return promise;
+}
+
 ScriptPromise ServiceWorkerClients::matchAll(ScriptState* scriptState, const ClientQueryOptions& options)
 {
     ExecutionContext* executionContext = scriptState->executionContext();