tsweb: don't hook up pprof handlers in javascript builds

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>

tsweb/pprof_default.go

@@ -0,0 +1,24 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build !js
+
+package tsweb
+
+import (
+	"net/http"
+	"net/http/pprof"
+)
+
+func addProfilingHandlers(d *DebugHandler) {
+	// pprof.Index serves everything that runtime/pprof.Lookup finds:
+	// goroutine, threadcreate, heap, allocs, block, mutex
+	d.Handle("pprof/", "pprof (index)", http.HandlerFunc(pprof.Index))
+	// But register the other ones from net/http/pprof directly:
+	d.HandleSilent("pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
+	d.HandleSilent("pprof/profile", http.HandlerFunc(pprof.Profile))
+	d.HandleSilent("pprof/symbol", http.HandlerFunc(pprof.Symbol))
+	d.HandleSilent("pprof/trace", http.HandlerFunc(pprof.Trace))
+	d.URL("/debug/pprof/goroutine?debug=1", "Goroutines (collapsed)")
+	d.URL("/debug/pprof/goroutine?debug=2", "Goroutines (full)")
+}