Share EffectiveLicenseFiles for snapshot modules

License files must be captured with the snapshot modules. NoticeFiles
does not have the information provided by the `license` module.
Reading the `Effective_license_text`, snapshot includes the required
license files.

Bug: 190690041
Test: build
      check the NOTICE files built from snapshots
Change-Id: I96c4579b4bef484cbb39fc06c707742a02a2b90b

android/module.go

@@ -473,6 +473,7 @@ type Module interface {
 	InitRc() Paths
 	VintfFragments() Paths
 	NoticeFiles() Paths
+	EffectiveLicenseFiles() Paths
 
 	AddProperties(props ...interface{})
 	GetProperties() []interface{}
@@ -1505,6 +1506,10 @@ func (m *ModuleBase) ExportedToMake() bool {
 	return m.commonProperties.NamespaceExportedToMake
 }
 
+func (m *ModuleBase) EffectiveLicenseFiles() Paths {
+	return m.commonProperties.Effective_license_text
+}
+
 // computeInstallDeps finds the installed paths of all dependencies that have a dependency
 // tag that is annotated as needing installation via the IsInstallDepNeeded method.
 func (m *ModuleBase) computeInstallDeps(ctx ModuleContext) ([]*installPathsDepSet, []*packagingSpecsDepSet) {

cc/linkable.go

@@ -88,6 +88,9 @@ type Snapshottable interface {
 	// SnapshotLibrary returns true if this module is a snapshot library.
 	IsSnapshotLibrary() bool
 
+	// EffectiveLicenseFiles returns the list of License files for this module.
+	EffectiveLicenseFiles() android.Paths
+
 	// SnapshotRuntimeLibs returns a list of libraries needed by this module at runtime but which aren't build dependencies.
 	SnapshotRuntimeLibs() []string
 

cc/vendor_snapshot.go

@@ -501,13 +501,13 @@ func (c *snapshotSingleton) GenerateBuildActions(ctx android.SingletonContext) {
 			headers = append(headers, m.SnapshotHeaders()...)
 		}
 
-		if len(m.NoticeFiles()) > 0 {
+		if len(m.EffectiveLicenseFiles()) > 0 {
 			noticeName := ctx.ModuleName(m) + ".txt"
 			noticeOut := filepath.Join(noticeDir, noticeName)
 			// skip already copied notice file
 			if !installedNotices[noticeOut] {
 				installedNotices[noticeOut] = true
-				snapshotOutputs = append(snapshotOutputs, combineNoticesRule(ctx, m.NoticeFiles(), noticeOut))
+				snapshotOutputs = append(snapshotOutputs, combineNoticesRule(ctx, m.EffectiveLicenseFiles(), noticeOut))
 			}
 		}
 	})