Enable AppEngine profiling endpoints.

appengine/gaemiddleware/routes.go

Index: appengine/gaemiddleware/routes.go
diff --git a/appengine/gaemiddleware/routes.go b/appengine/gaemiddleware/routes.go
index d4237087795b608cc125a91c8566fc3f7dbb9802..cefc78a7e3008eed9157733e083f97a638d7128b 100644
--- a/appengine/gaemiddleware/routes.go
+++ b/appengine/gaemiddleware/routes.go
@@ -5,6 +5,8 @@
 package gaemiddleware
 
 import (
+	"github.com/luci/luci-go/common/runtime/profiling"
+	"github.com/luci/luci-go/server/auth"
 	"github.com/luci/luci-go/server/router"
 	"github.com/luci/luci-go/server/settings/admin"
 
@@ -28,4 +30,8 @@ func InstallHandlers(r *router.Router, base router.MiddlewareChain) {
 	gaeauth.InstallHandlers(r, base)
 	tsmon.InstallHandlers(r, base)
 	admin.InstallHandlers(r, base, &gaeauth.UsersAPIAuthMethod{})
+
+	profiling.InstallHandlers(r, base.Extend(
+		auth.Autologin,
+		RequireSuperuser))
 }