milo: Add a build info Swarming implementation.

milo/appengine/swarming/html_data.go

Index: milo/appengine/swarming/html_data.go
diff --git a/milo/appengine/swarming/html_data.go b/milo/appengine/swarming/html_data.go
index 9c7c4f163ad46904afe541b5f9a22da3fb0c2976..fb54fd8a9e995c9c01b1d3b4be7f23cb49c1eae9 100644
--- a/milo/appengine/swarming/html_data.go
+++ b/milo/appengine/swarming/html_data.go
@@ -17,6 +17,7 @@ import (
 
 	swarming "github.com/luci/luci-go/common/api/swarming/swarming/v1"
 	"github.com/luci/luci-go/common/clock/testclock"
+	"github.com/luci/luci-go/common/errors"
 	"github.com/luci/luci-go/milo/api/resp"
 	"github.com/luci/luci-go/milo/appengine/settings"
 	"github.com/luci/luci-go/server/templates"
@@ -87,6 +88,12 @@ func (svc debugSwarmingService) getSwarmingResult(c context.Context, taskID stri
 	return &sr, nil
 }
 
+func (svc debugSwarmingService) getSwarmingRequest(c context.Context, taskID string) (
+	*swarming.SwarmingRpcsTaskRequest, error) {
+
+	return nil, errors.New("not implemented")
+}
+
 func (svc debugSwarmingService) getTaskOutput(c context.Context, taskID string) (string, error) {
 	content, err := svc.getContent(taskID, "")
 	if err != nil {