dashboard: add windows-arm builder

Updates golang/go#26148

Change-Id: I23a2c7bd1c2f8f7c960aaedfe0dcdee4e11825ab
Reviewed-on: https://go-review.googlesource.com/125643
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Author: bradfitz

dashboard/builders.go

@@ -267,6 +267,12 @@ var Hosts = map[string]*HostConfig{
 		goBootstrapURLTmpl: "https://storage.googleapis.com/$BUCKET/go1.4-windows-amd64.tar.gz",
 		SSHUsername:        "gopher",
 	},
+	"host-windows-arm-iotcore": &HostConfig{
+		IsReverse:   true,
+		ExpectNum:   1,
+		OwnerGithub: "jordanrh1",
+		env:         []string{"GOROOT_BOOTSTRAP=C:\\Data\\Go"},
+	},
 	"host-darwin-10_8": &HostConfig{
 		IsReverse: true,
 		ExpectNum: 0,
@@ -1321,6 +1327,14 @@ func init() {
 			// up:
 			"GO_TEST_TIMEOUT_SCALE=2"},
 	})
+	addBuilder(BuildConfig{
+		Name:     "windows-arm",
+		HostType: "host-windows-arm-iotcore",
+		env: []string{
+			"GOARM=7",
+			"GO_TEST_TIMEOUT_SCALE=2",
+		},
+	})
 	addBuilder(BuildConfig{
 		Name:              "darwin-amd64-10_8",
 		HostType:          "host-darwin-10_8",