Revert "Revert "Create a product variable for skipping apex cont..."

Revert submission 2966055-revert-2964509-skip-apex-contributions-EOKWOFHENC

Reason for revert: The root cause CL has been reverted https://googleplex-android-review.git.corp.google.com/c/platform/vendor/google/build/+/26268799

Reverted changes: /q/submissionid:2966055-revert-2964509-skip-apex-contributions-EOKWOFHENC

Change-Id: I93e8f60124a09b4fba4675ac7f128ab553102bf7
diff --git a/android/variable.go b/android/variable.go
index a4917c5..4a8da82 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -495,6 +495,8 @@
 	BuildFlags map[string]string `json:",omitempty"`
 
 	BuildFromSourceStub *bool `json:",omitempty"`
+
+	BuildIgnoreApexContributionContents []string `json:",omitempty"`
 }
 
 type PartitionQualifiedVariablesType struct {