vendor: update all dependencies

vendor/cloud.google.com/go/trace/httpexample_test.go

@@ -0,0 +1,57 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.7
+
+package trace_test
+
+import (
+	"log"
+	"net/http"
+
+	"cloud.google.com/go/trace"
+)
+
+var traceClient *trace.Client
+
+func ExampleHTTPClient_Do() {
+	client := http.Client{
+		Transport: &trace.Transport{},
+	}
+	span := traceClient.NewSpan("/foo") // traceClient is a *trace.Client
+
+	req, _ := http.NewRequest("GET", "https://metadata/users", nil)
+	req = req.WithContext(trace.NewContext(req.Context(), span))
+
+	if _, err := client.Do(req); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleClient_HTTPHandler() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		client := http.Client{
+			Transport: &trace.Transport{},
+		}
+
+		req, _ := http.NewRequest("GET", "https://metadata/users", nil)
+		req = req.WithContext(r.Context())
+
+		// The outgoing request will be traced with r's trace ID.
+		if _, err := client.Do(req); err != nil {
+			log.Fatal(err)
+		}
+	})
+	http.Handle("/foo", traceClient.HTTPHandler(handler)) // traceClient is a *trace.Client
+}