getInstalledRelatedApps: Add browser-side Mojo service (stub).

content/browser/installedapp/installed_app_provider_impl_default.cc

+// Copyright 2017 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 "content/browser/installedapp/installed_app_provider_impl_default.h"
+
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace content {
+
+InstalledAppProviderImplDefault::InstalledAppProviderImplDefault() {}
+
+InstalledAppProviderImplDefault::~InstalledAppProviderImplDefault() {}
+
+void InstalledAppProviderImplDefault::FilterInstalledApps(
+    std::vector<blink::mojom::RelatedApplicationPtr> relatedApps,
+    const std::string& origin,
+    const FilterInstalledAppsCallback& callback) {
+  // Do not return any results (in the default implementation, there are no
+  // installed related apps).
+  callback.Run(std::vector<blink::mojom::RelatedApplicationPtr>());
+}
+
+// static
+void InstalledAppProviderImplDefault::Create(
+    mojo::InterfaceRequest<blink::mojom::InstalledAppProvider> request) {
+  mojo::MakeStrongBinding(base::MakeUnique<InstalledAppProviderImplDefault>(),
+                          std::move(request));
+}
+
+}  // namespace content