Contents validation of override_apex's bootclasspath fragments

https://r.android.com/3083813 added support for overriding
min_sdk_version, and creating separate variants of transitive
dependencies of override apexes. This causes issues when there is a skew
between apex boot jars of source and prebuilt mainline modules. For
mediaprovider google apex, we now have _two_ source variants of
mediaprovider bcp fragment module.

This CL uses ApexInfo.BaseApexName to skip the check on both variants of
bootclasspath/systemserverclasspath fragments.

This CL also removes the prefix based check to determine if prebuilts
are active. If RELEASE_APEX_CONTRIBUTIONS for a specific mainline module
is set, it will be assumed that prebuilts for that mainline module are
active.

Test: go test ./apex ./java
Bug: 361771739

Change-Id: I01f7ef437df8f10b74ffa397ba461ff4f1f9bed6

java/dexpreopt.go

@@ -210,15 +210,19 @@ func disableSourceApexVariant(ctx android.BaseModuleContext) bool {
 		}
 	})
 	// Find the apex variant for this module
-	_, apexVariantsWithoutTestApexes, _ := android.ListSetDifference(apexInfo.InApexVariants, apexInfo.TestApexes)
+	var apexVariantsWithoutTestApexes []string
+	if apexInfo.BaseApexName != "" {
+		// This is a transitive dependency of an override_apex
+		apexVariantsWithoutTestApexes = []string{apexInfo.BaseApexName}
+	} else {
+		_, apexVariantsWithoutTestApexes, _ = android.ListSetDifference(apexInfo.InApexVariants, apexInfo.TestApexes)
+	}
 	disableSource := false
 	// find the selected apexes
 	for _, apexVariant := range apexVariantsWithoutTestApexes {
-		for _, selected := range psi.GetSelectedModulesForApiDomain(apexVariant) {
-			// If the apex_contribution for this api domain contains a prebuilt apex, disable the source variant
-			if strings.HasPrefix(selected, "prebuilt_com.google.android") {
-				disableSource = true
-			}
+		if len(psi.GetSelectedModulesForApiDomain(apexVariant)) > 0 {
+			// If the apex_contribution for this api domain is non-empty, disable the source variant
+			disableSource = true
 		}
 	}
 	return disableSource