Implement "appinstalled" event on Android.

third_party/WebKit/Source/modules/installation/InstallationServiceImpl.h

+// 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.
+
+#ifndef InstallationServiceImpl_h
+#define InstallationServiceImpl_h
+
+#include "modules/ModulesExport.h"
+#include "public/platform/modules/installation/installation.mojom-blink.h"
+
+namespace blink {
+
+class LocalFrame;
+
+class MODULES_EXPORT InstallationServiceImpl final
+    : public mojom::blink::InstallationService {
+ public:
+  explicit InstallationServiceImpl(LocalFrame*);
+
+  static void create(LocalFrame*, mojom::blink::InstallationServiceRequest);
+
+  void OnInstall() override;
+
+ private:
+  LocalFrame* m_frame;
+};
+
+}  // namespace blink
+
+#endif  // InstallationServiceImpl_h