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

third_party/WebKit/Source/modules/installedapp/InstalledAppController.h

Index: third_party/WebKit/Source/modules/installedapp/InstalledAppController.h
diff --git a/third_party/WebKit/Source/modules/installedapp/InstalledAppController.h b/third_party/WebKit/Source/modules/installedapp/InstalledAppController.h
index ba73fc4917527fb0c66ea84f6ba6d6a99a2ee467..fe88611c3ee26fce0fc101270da0ee991a8bb0e1 100644
--- a/third_party/WebKit/Source/modules/installedapp/InstalledAppController.h
+++ b/third_party/WebKit/Source/modules/installedapp/InstalledAppController.h
@@ -12,6 +12,8 @@
 #include "public/platform/WebVector.h"
 #include "public/platform/modules/installedapp/WebRelatedApplication.h"
 #include "public/platform/modules/installedapp/WebRelatedAppsFetcher.h"
+#include "public/platform/modules/installedapp/installed_app_provider.mojom-blink.h"
+#include "public/platform/modules/installedapp/related_application.mojom-blink.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
@@ -57,6 +59,13 @@ class MODULES_EXPORT InstalledAppController final
                              const WebVector<WebRelatedApplication>&,
                              std::unique_ptr<AppInstalledCallbacks>);
 
+  // Callback from the InstalledAppProvider mojo service.
+  void OnFilterInstalledApps(std::unique_ptr<blink::AppInstalledCallbacks>,
+                             WTF::Vector<mojom::blink::RelatedApplicationPtr>);
+
+  // Handle to the InstalledApp mojo service.
+  mojom::blink::InstalledAppProviderPtr m_provider = nullptr;
+
   WebRelatedAppsFetcher* m_relatedAppsFetcher;
 };