Export htmlnotice, xmlnotice, and textnotice.

Bug: 151177513
Bug: 210912771

Test: m all dist
Test: flash; About Phone -> Legal Information -> Third-party licenses

Change-Id: I9b9e3a67230dae6236ee5c5d6dc6edbc23c5a91d
diff --git a/android/licenses.go b/android/licenses.go
index e9e271b..b82d8d7 100644
--- a/android/licenses.go
+++ b/android/licenses.go
@@ -316,4 +316,7 @@
 func licensesMakeVarsProvider(ctx MakeVarsContext) {
 	ctx.Strict("BUILD_LICENSE_METADATA",
 		ctx.Config().HostToolPath(ctx, "build_license_metadata").String())
+	ctx.Strict("HTMLNOTICE", ctx.Config().HostToolPath(ctx, "htmlnotice").String())
+	ctx.Strict("XMLNOTICE", ctx.Config().HostToolPath(ctx, "xmlnotice").String())
+	ctx.Strict("TEXTNOTICE", ctx.Config().HostToolPath(ctx, "textnotice").String())
 }