misc/dashboard/app: make the builders test go.talks and go.exp

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7419048

misc/dashboard/app/build/build.go

@@ -188,7 +188,7 @@ func partsToHash(c *Commit, p []string) *Result {
 //
 // Each Result entity is a descendant of its associated Commit entity.
 type Result struct {
-	Builder     string // "arch-os[-note]"
+	Builder     string // "os-arch[-note]"
 	Hash        string
 	PackagePath string // (empty for Go commits)
 

misc/dashboard/app/build/init.go

@@ -24,6 +24,8 @@ var subRepos = []string{
 	"crypto",
 	"image",
 	"net",
+	"talks",
+	"exp",
 }
 
 // Put subRepos into defaultPackages.