Enable AppEngine profiling endpoints.

logdog/appengine/cmd/coordinator/vmuser/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 main
 
 import (
         "net/http"
 
+        // Importing pprof implicitly installs "/debug/*" profiling handlers.
+        _ "net/http/pprof"
+
         "github.com/luci/luci-go/appengine/gaemiddleware"
         log "github.com/luci/luci-go/common/logging"
         "github.com/luci/luci-go/grpc/discovery"
         "github.com/luci/luci-go/grpc/prpc"
         adminPb "github.com/luci/luci-go/logdog/api/endpoints/coordinator/admin/v1"
         logsPb "github.com/luci/luci-go/logdog/api/endpoints/coordinator/logs/v1"
         registrationPb "github.com/luci/luci-go/logdog/api/endpoints/coordinator/registration/v1"
         servicesPb "github.com/luci/luci-go/logdog/api/endpoints/coordinator/services/v1"
         "github.com/luci/luci-go/logdog/appengine/coordinator"
         "github.com/luci/luci-go/logdog/appengine/coordinator/config"
@@ skipping 51 matching lines @@
                 return false
         }
 
         for _, o := range ccfg.RpcAllowOrigins {
                 if o == origin {
                         return true
                 }
         }
         return false
 }