Pass results of Finder into Blueprint

Bug: 64363847
Test: m -j

Change-Id: I79db8c524af6e77c35a0199ec1876e5eb94e8971
diff --git a/ui/build/soong.go b/ui/build/soong.go
index d3bcf87..6dafd27 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -36,6 +36,7 @@
 		cmd.Environment.Set("BOOTSTRAP", "./build/blueprint/bootstrap.bash")
 		cmd.Environment.Set("BUILDDIR", config.SoongOutDir())
 		cmd.Environment.Set("GOROOT", filepath.Join("./prebuilts/go", config.HostPrebuiltTag()))
+		cmd.Environment.Set("BLUEPRINT_LIST_FILE", filepath.Join(config.FileListDir(), "Android.bp.list"))
 		cmd.Environment.Set("NINJA_BUILDDIR", config.OutDir())
 		cmd.Environment.Set("SRCDIR", ".")
 		cmd.Environment.Set("TOPNAME", "Android.bp")