Make sure dist files have license metadata.

Bug: 151177513
Bug: 210912771

Test: m droid dist reportmissinglicenses

Change-Id: I0c85f6c49a3e9d9bb3219ed6ddfb939d90f80656
diff --git a/android/androidmk.go b/android/androidmk.go
index 5c715b4..6b675a6 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -288,6 +288,8 @@
 
 // The contributions to the dist.
 type distContributions struct {
+	// Path to license metadata file.
+	licenseMetadataFile Path
 	// List of goals and the dist copy instructions.
 	copiesForGoals []*copiesForGoals
 }
@@ -364,6 +366,8 @@
 	// Collate the contributions this module makes to the dist.
 	distContributions := &distContributions{}
 
+	distContributions.licenseMetadataFile = amod.licenseMetadataFile
+
 	// Iterate over this module's dist structs, merged from the dist and dists properties.
 	for _, dist := range amod.Dists() {
 		// Get the list of goals this dist should be enabled for. e.g. sdk, droidcore
@@ -456,6 +460,10 @@
 		for _, c := range d.copies {
 			ret = append(
 				ret,
+				fmt.Sprintf("$(if $(strip $(ALL_TARGETS.%s.META_LIC)),,$(eval ALL_TARGETS.%s.META_LIC := %s))\n",
+					c.from.String(), c.from.String(), distContributions.licenseMetadataFile.String()))
+			ret = append(
+				ret,
 				fmt.Sprintf("$(call dist-for-goals,%s,%s:%s)\n", d.goals, c.from.String(), c.dest))
 		}
 	}