cmd/vendor/github.com/google/pprof: refresh from upstream

Update vendored pprof to commit 4fc39a00b6b8c1aad05260f01429ec70e127252c
from github.com/google/pprof (2017-11-01).

Fixes #19380
Updates #21047

Change-Id: Ib64a94a45209039e5945acbcfa0392790c8ee41e
Reviewed-on: https://go-review.googlesource.com/57370
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/cmd/vendor/github.com/google/pprof/internal/plugin/plugin.go b/src/cmd/vendor/github.com/google/pprof/internal/plugin/plugin.go
index d14ac2c215..e5878aed70 100644
--- a/src/cmd/vendor/github.com/google/pprof/internal/plugin/plugin.go
+++ b/src/cmd/vendor/github.com/google/pprof/internal/plugin/plugin.go
@@ -17,6 +17,7 @@ package plugin
 
 import (
 	"io"
+	"net/http"
 	"regexp"
 	"time"
 
@@ -31,6 +32,16 @@ type Options struct {
 	Sym     Symbolizer
 	Obj     ObjTool
 	UI      UI
+
+	// HTTPServer is a function that should block serving http requests,
+	// including the handlers specfied in args.  If non-nil, pprof will
+	// invoke this function if necessary to provide a web interface.
+	//
+	// If HTTPServer is nil, pprof will use its own internal HTTP server.
+	//
+	// A common use for a custom HTTPServer is to provide custom
+	// authentication checks.
+	HTTPServer func(args *HTTPServerArgs) error
 }
 
 // Writer provides a mechanism to write data under a certain name,
@@ -185,3 +196,17 @@ type UI interface {
 	// the auto-completion of cmd, if the UI supports auto-completion at all.
 	SetAutoComplete(complete func(string) string)
 }
+
+// HTTPServerArgs contains arguments needed by an HTTP server that
+// is exporting a pprof web interface.
+type HTTPServerArgs struct {
+	// Hostport contains the http server address (derived from flags).
+	Hostport string
+
+	Host string // Host portion of Hostport
+	Port int    // Port portion of Hostport
+
+	// Handlers maps from URL paths to the handler to invoke to
+	// serve that path.
+	Handlers map[string]http.Handler
+}