Add bazel paths to ninja deps.

Test: m nothing
Test: m nothing --bazel-mode-dev
Change-Id: I120e62ac3f2aa066aedaecf2a5d16c79f7097c76
diff --git a/ui/build/soong.go b/ui/build/soong.go
index e0d67cc..28c6ec9 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -404,6 +404,7 @@
 	soongBuildEnv.Set("BAZEL_WORKSPACE", absPath(ctx, "."))
 	soongBuildEnv.Set("BAZEL_METRICS_DIR", config.BazelMetricsDir())
 	soongBuildEnv.Set("LOG_DIR", config.LogsDir())
+	soongBuildEnv.Set("BAZEL_DEPS_FILE", filepath.Join(os.Getenv("TOP"), config.OutDir(), "tools", "bazel.list"))
 
 	// For Soong bootstrapping tests
 	if os.Getenv("ALLOW_MISSING_DEPENDENCIES") == "true" {