Enable AppEngine profiling endpoints.

logdog/appengine/cmd/coordinator/backend/main.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package module
 
 import (
         "net/http"
 
+        // Importing pprof implicitly installs "/debug/*" profiling handlers.
+        _ "net/http/pprof"
+
         "github.com/luci/luci-go/appengine/gaemiddleware"
         "github.com/luci/luci-go/logdog/appengine/coordinator"
         "github.com/luci/luci-go/server/router"
         "github.com/luci/luci-go/tumble"
 
         // Include mutations package so its Mutations will register with tumble via
         // init().
         _ "github.com/luci/luci-go/logdog/appengine/coordinator/mutations"
 )
 
 func init() {
         tmb := tumble.Service{}
 
         r := router.New()
         base := gaemiddleware.BaseProd().Extend(coordinator.ProdCoordinatorService)
         tmb.InstallHandlers(r, base)
         gaemiddleware.InstallHandlers(r, base)
 
         http.Handle("/", r)
 }