Add source file provider for genrule/srcs, python libraries and rust libraries.

Change-Id: I2d7d4684a10c15aeecc27b8db800ab27a807d2e2
diff --git a/genrule/genrule.go b/genrule/genrule.go
index 8f2c047..6b11019 100644
--- a/genrule/genrule.go
+++ b/genrule/genrule.go
@@ -424,6 +424,7 @@
 		return srcFiles
 	}
 	srcFiles := addLabelsForInputs("srcs", g.properties.Srcs, g.properties.Exclude_srcs)
+	ctx.SetProvider(blueprint.SrcsFileProviderKey, blueprint.SrcsFileProviderData{SrcPaths: srcFiles.Strings()})
 
 	var copyFrom android.Paths
 	var outputFiles android.WritablePaths