From 7935ece62b5df7d253af014bd27b272c4ba62587 Mon Sep 17 00:00:00 2001
From: Burcu Dogan <jbd@google.com>
Date: Mon, 14 Jul 2014 10:59:30 -0700
Subject: [PATCH] Export Transport to allow default transport to be
 configurable.

---
 google/appengine.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/google/appengine.go b/google/appengine.go
index ebdde07..df4efd1 100644
--- a/google/appengine.go
+++ b/google/appengine.go
@@ -14,8 +14,11 @@ import (
 // AppEngineConfig represents a configuration for an
 // App Engine application's Google service account.
 type AppEngineConfig struct {
-	context appengine.Context
-	scopes  []string
+	// Default transport to be used while constructing
+	// oauth2.Transport instances from this configuration.
+	Transport *urlfetch.Transport
+	context   appengine.Context
+	scopes    []string
 }
 
 // NewAppEngineConfig creates a new AppEngineConfig for the
@@ -27,6 +30,9 @@ func NewAppEngineConfig(context appengine.Context, scopes []string) *AppEngineCo
 // NewTransport returns a transport that authorizes
 // the requests with the application's service account.
 func (c *AppEngineConfig) NewTransport() oauth2.Transport {
+	if c.Transport != nil {
+		return oauth2.NewAuthorizedTransport(c.Transport, c, nil)
+	}
 	transport := &urlfetch.Transport{
 		Context:                       c.context,
 		Deadline:                      0,