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

content/browser/installedapp/installed_app_provider_impl_default.h

Index: content/browser/installedapp/installed_app_provider_impl_default.h
diff --git a/content/browser/installedapp/installed_app_provider_impl_default.h b/content/browser/installedapp/installed_app_provider_impl_default.h
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+++ b/content/browser/installedapp/installed_app_provider_impl_default.h
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+// 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.
+
+#ifndef CONTENT_BROWSER_INSTALLEDAPP_INSTALLED_APP_PROVIDER_IMPL_DEFAULT_H
+#define CONTENT_BROWSER_INSTALLEDAPP_INSTALLED_APP_PROVIDER_IMPL_DEFAULT_H
+
+#include <string>
+#include <vector>
+
+#include "third_party/WebKit/public/platform/modules/installedapp/installed_app_provider.mojom.h"
+#include "third_party/WebKit/public/platform/modules/installedapp/related_application.mojom.h"
+
+namespace content {
+
+// The default (no-op) implementation of the InstalledAppProvider Mojo service.
+// This always returns an empty set of related applications.
+class InstalledAppProviderImplDefault
+    : public blink::mojom::InstalledAppProvider {
+ public:
+  InstalledAppProviderImplDefault();
+  ~InstalledAppProviderImplDefault() override;
+
+  // InstalledAppProvider overrides:
+  void FilterInstalledApps(
+      std::vector<blink::mojom::RelatedApplicationPtr> related_apps,
+      const FilterInstalledAppsCallback& callback) override;
+
+  static void Create(
+      mojo::InterfaceRequest<blink::mojom::InstalledAppProvider> request);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_INSTALLEDAPP_INSTALLED_APP_PROVIDER_IMPL_DEFAULT_H