telegram: use common begin time, bump timeout

We want all network events and other events used by telegram to use the
same common begin of time, so we can correlate events.

While there, bump timeout to 60 seconds.

Part of #55.

experiment/telegram/telegram.go

@@ -15,7 +15,7 @@ import (
 
 const (
 	testName    = "telegram"
-	testVersion = "0.1.0"
+	testVersion = "0.1.1"
 )
 
 // Config contains the telegram experiment config.
@@ -99,7 +99,7 @@ func (m measurer) ExperimentVersion() string {
 
 func (m measurer) Run(ctx context.Context, sess model.ExperimentSession,
 	measurement *model.Measurement, callbacks model.ExperimentCallbacks) error {
-	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	ctx, cancel := context.WithTimeout(ctx, 60*time.Second)
 	defer cancel()
 	urlgetter.RegisterExtensions(measurement)
 	inputs := []urlgetter.MultiInput{
@@ -118,7 +118,7 @@ func (m measurer) Run(ctx context.Context, sess model.ExperimentSession,
 		{Target: "http://web.telegram.org/", Config: urlgetter.Config{Method: "GET"}},
 		{Target: "https://web.telegram.org/", Config: urlgetter.Config{Method: "GET"}},
 	}
-	multi := urlgetter.Multi{Session: sess}
+	multi := urlgetter.Multi{Begin: time.Now(), Session: sess}
 	testkeys := NewTestKeys()
 	testkeys.Agent = "redirect"
 	measurement.TestKeys = testkeys