internal/frontend: add additional pprof memory handlers

- Add additional handlers for heap, allocs, blocks and goroutines.

Change-Id: I3c7e46cad6a34aca07f61d6dc3026ac4c1da113f
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/721760
Auto-Submit: Ethan Lee <[email protected]>
kokoro-CI: kokoro <[email protected]>
Reviewed-by: Robert Findley <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: ethanalee-work

internal/frontend/server.go

@@ -257,6 +257,10 @@ func (s *Server) installDebugHandlers(handle func(string, http.Handler)) {
 	handle("/_debug/pprof/profile", ifDebug(hpprof.Profile))
 	handle("/_debug/pprof/symbol", ifDebug(hpprof.Symbol))
 	handle("/_debug/pprof/trace", ifDebug(hpprof.Trace))
+	handle("/_debug/pprof/heap", ifDebug(hpprof.Handler("heap").ServeHTTP))
+	handle("/_debug/pprof/allocs", ifDebug(hpprof.Handler("allocs").ServeHTTP))
+	handle("/_debug/pprof/block", ifDebug(hpprof.Handler("block").ServeHTTP))
+	handle("/_debug/pprof/goroutine", ifDebug(hpprof.Handler("goroutine").ServeHTTP))
 
 	handle("/_debug/info", ifDebug(func(w http.ResponseWriter, _ *http.Request) {
 		row := func(a, b string) {