Refactor BeforeInstallPromptEvent to use ScriptPromiseProperty

Source/modules/app_banner/AppBannerCallbacks.cpp

Index: Source/modules/app_banner/AppBannerCallbacks.cpp
diff --git a/Source/modules/app_banner/AppBannerCallbacks.cpp b/Source/modules/app_banner/AppBannerCallbacks.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..148010581f94a5364526200f8aef2bf7fb74e448
--- /dev/null
+++ b/Source/modules/app_banner/AppBannerCallbacks.cpp
@@ -0,0 +1,21 @@
+// Copyright 2015 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/app_banner/AppBannerCallbacks.h"
+
+namespace blink {
+
+AppBannerCallbacks::AppBannerCallbacks(UserChoiceProperty* userChoice)
+    : m_userChoice(userChoice)
+{
+}
+
+void AppBannerCallbacks::onSuccess(WebAppBannerPromptResult* result)
+{
+    OwnPtr<WebAppBannerPromptResult> ownPtr = adoptPtr(result);
+    m_userChoice->resolve(AppBannerPromptResult::take(ownPtr.release()));

[mlamouri (slow - plz ping), 2015/07/24 15:08:25]

There is no way to do that in one line? (ie. not have to create an OwnPtr<> on
the stack in order to pass a PassOwnPtr<>?

[dominickn, 2015/07/24 23:53:35]

Done.

+}
+
+} // namespace blink