Sandbox html_viewer on Linux.

mandoline/app/core_services_initialization.cc

Index: mandoline/app/core_services_initialization.cc
diff --git a/mandoline/app/core_services_initialization.cc b/mandoline/app/core_services_initialization.cc
index 304fe1e626f62a6707c576556df6a886f7fe2c43..7f1dd123693899419e695f6b8b92ce086db32d20 100644
--- a/mandoline/app/core_services_initialization.cc
+++ b/mandoline/app/core_services_initialization.cc
@@ -16,6 +16,10 @@ void InitCoreServicesForContext(mojo::runner::Context* context) {
       GURL("mojo:clipboard"), GURL("mojo:core_services"), "Sandboxed Core");
   manager->RegisterApplicationPackageAlias(GURL("mojo:filesystem"),
                                            GURL("mojo:core_services"), "Files");
+#if defined(OS_LINUX) && !defined(OS_ANDROID)
+  manager->RegisterApplicationPackageAlias(GURL("mojo:font_service"),
+                                           GURL("mojo:core_services"), "Files");
+#endif
 #if !defined(OS_ANDROID)
   // On Android, these are Java apps which are loaded in the shell process.
   manager->RegisterApplicationPackageAlias(GURL("mojo:view_manager"),