Disable source apex variant using apex_available_name

There are two versions of aosp extservices - one for Tplus and one for
Sminus. When prebuilts are active, the `contents` validation of both
variants of extservices bootclasspath fragments should be disabled to
account for BCP jar skew.

This CL adds ApexAvailableName to ApexInfo to achive that. If an
api_domain matching the ApexAvailableName has been selected in
`all_apex_contributions`, the source apex variants will be disabled.

Bug: 361771739

Test: lunch cf_x86_64_phone-next-userdebug
Test: m nothing with ag/28851886
Change-Id: I505a7ad8295c258e2eeef7f183669f7a75a1c88e

android/apex.go

@@ -87,6 +87,9 @@ type ApexInfo struct {
 
 	// Returns the name of the overridden apex (com.android.foo)
 	BaseApexName string
+
+	// Returns the value of `apex_available_name`
+	ApexAvailableName string
 }
 
 // AllApexInfo holds the ApexInfo of all apexes that include this module.

apex/apex.go

@@ -1073,6 +1073,7 @@ func (a *apexBundle) ApexInfoMutator(mctx android.TopDownMutatorContext) {
 		ApexContents:      []*android.ApexContents{apexContents},
 		TestApexes:        testApexes,
 		BaseApexName:      mctx.ModuleName(),
+		ApexAvailableName: proptools.String(a.properties.Apex_available_name),
 	}
 	mctx.WalkDeps(func(child, parent android.Module) bool {
 		if !continueApexDepsWalk(child, parent) {

java/dexpreopt.go

@@ -209,13 +209,18 @@ func disableSourceApexVariant(ctx android.BaseModuleContext) bool {
 			psi = prebuiltSelectionInfo
 		}
 	})
+
 	// Find the apex variant for this module
-	var apexVariantsWithoutTestApexes []string
+	apexVariantsWithoutTestApexes := []string{}
 	if apexInfo.BaseApexName != "" {
 		// This is a transitive dependency of an override_apex
-		apexVariantsWithoutTestApexes = []string{apexInfo.BaseApexName}
+		apexVariantsWithoutTestApexes = append(apexVariantsWithoutTestApexes, apexInfo.BaseApexName)
 	} else {
-		_, apexVariantsWithoutTestApexes, _ = android.ListSetDifference(apexInfo.InApexVariants, apexInfo.TestApexes)
+		_, variants, _ := android.ListSetDifference(apexInfo.InApexVariants, apexInfo.TestApexes)
+		apexVariantsWithoutTestApexes = append(apexVariantsWithoutTestApexes, variants...)
+	}
+	if apexInfo.ApexAvailableName != "" {
+		apexVariantsWithoutTestApexes = append(apexVariantsWithoutTestApexes, apexInfo.ApexAvailableName)
 	}
 	disableSource := false
 	// find the selected apexes