Bindings and client interface for the IsAppInstalled API.

third_party/WebKit/Source/modules/installedapp/InstalledAppController.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/installedapp/InstalledAppController.h"
+
+#include "core/frame/LocalFrame.h"
+#include "platform/RuntimeEnabledFeatures.h"
+#include "public/platform/WebSecurityOrigin.h"
+
+namespace blink {
+
+InstalledAppController::~InstalledAppController()
+{
+}
+
+void InstalledAppController::provideTo(LocalFrame& frame, WebInstalledApp* client)
+{
+    ASSERT(RuntimeEnabledFeatures::installedAppEnabled());
+
+    InstalledAppController* controller = new InstalledAppController(frame, client);
+    WillBeHeapSupplement<LocalFrame>::provideTo(frame, supplementName(), adoptPtrWillBeNoop(controller));

[haraken, 2016/02/27 15:53:11]

OwnPtr<InstalledAppController> controllers = adoptPtr(new ...);
provideTo(..., controllers.release());

[Daniel Nishi, 2016/02/29 18:38:38]

.release() for an OwnPtr is an OwnPtr, whereas provideTo expects a raw ptr.

Does this pattern work? I found it used for other provideTo frame places in the
code base.

+}
+
+InstalledAppController* InstalledAppController::from(LocalFrame& frame)
+{
+    return static_cast<InstalledAppController*>(WillBeHeapSupplement<LocalFrame>::from(frame, supplementName()));

[haraken, 2016/02/27 15:53:11]

Can we add an assert to check that the returned InstalledAppController is never
null?

[Daniel Nishi, 2016/02/29 18:38:39]

Done.

+}
+
+InstalledAppController::InstalledAppController(LocalFrame& frame, WebInstalledApp* client)
+    : LocalFrameLifecycleObserver(&frame)
+    , m_client(client)
+{
+}
+
+const char* InstalledAppController::supplementName()
+{
+    return "InstalledAppController";
+}
+
+void InstalledAppController::getInstalledApps(const WebSecurityOrigin& url, AppInstalledCallbacks* callback)
+{
+    // When detached, the client is no longer valid.
+    if (!m_client) {
+        callback->onError();
+        delete callback;

[haraken, 2016/02/27 15:53:11]

It's really nasty to call delete manually... Can we avoid it by wrapping the
callback with OwnPtr or something?

[Daniel Nishi, 2016/02/29 18:38:38]

Done.

+        return;
+    }
+
+    // Client is expected to take ownership of the callback
+    m_client->getInstalledRelatedApps(url, callback);
+}
+
+void InstalledAppController::willDetachFrameHost()
+{
+    m_client = nullptr;
+}
+
+DEFINE_TRACE(InstalledAppController)
+{
+    WillBeHeapSupplement<LocalFrame>::trace(visitor);
+    LocalFrameLifecycleObserver::trace(visitor);
+}
+
+} // namespace blink