tpl/debug: Add debug.Timer

Closes #11580

deps/deps.go

@@ -33,7 +33,6 @@ import (
 // There will be normally only one instance of deps in play
 // at a given time, i.e. one per Site built.
 type Deps struct {
-
 	// The logger to use.
 	Log loggers.Logger `json:"-"`
 
@@ -77,6 +76,9 @@ type Deps struct {
 	// BuildStartListeners will be notified before a build starts.
 	BuildStartListeners *Listeners
 
+	// BuildEndListeners will be notified after a build finishes.
+	BuildEndListeners *Listeners
+
 	// Resources that gets closed when the build is done or the server shuts down.
 	BuildClosers *Closers
 
@@ -97,7 +99,6 @@ func (d Deps) Clone(s page.Site, conf config.AllProvider) (*Deps, error) {
 	}
 
 	return &d, nil
-
 }
 
 func (d *Deps) SetTempl(t *tpl.TemplateHandlers) {
@@ -132,6 +133,10 @@ func (d *Deps) Init() error {
 		d.BuildStartListeners = &Listeners{}
 	}
 
+	if d.BuildEndListeners == nil {
+		d.BuildEndListeners = &Listeners{}
+	}
+
 	if d.BuildClosers == nil {
 		d.BuildClosers = &Closers{}
 	}