Rename ApexName to ApexVariationName

In preparation for reusing the same variation for multiple apexes,
rename ApexName to ApexVariationName.

Bug: 164216768
Test: all soong tests
Change-Id: I88f2c5b192ffa27acd38e01952d0cefd413222a0
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index b445456..2a84f14 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -262,7 +262,7 @@
 	apex, isApexModule := module.(android.ApexModule)
 	fromUpdatableApex := isApexModule && apex.Updatable()
 	if image.name == artBootImageName {
-		if isApexModule && strings.HasPrefix(apex.ApexName(), "com.android.art.") {
+		if isApexModule && strings.HasPrefix(apex.ApexVariationName(), "com.android.art.") {
 			// ok: found the jar in the ART apex
 		} else if isApexModule && apex.IsForPlatform() && Bool(module.(*Library).deviceProperties.Hostdex) {
 			// exception (skip and continue): special "hostdex" platform variant
@@ -272,7 +272,7 @@
 			return -1, nil
 		} else if fromUpdatableApex {
 			// error: this jar is part of an updatable apex other than ART
-			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the ART boot image", name, apex.ApexName())
+			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the ART boot image", name, apex.ApexVariationName())
 		} else {
 			// error: this jar is part of the platform or a non-updatable apex
 			ctx.Errorf("module '%s' is not allowed in the ART boot image", name)
@@ -282,7 +282,7 @@
 			// ok: this jar is part of the platform or a non-updatable apex
 		} else {
 			// error: this jar is part of an updatable apex
-			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the framework boot image", name, apex.ApexName())
+			ctx.Errorf("module '%s' from updatable apex '%s' is not allowed in the framework boot image", name, apex.ApexVariationName())
 		}
 	} else {
 		panic("unknown boot image: " + image.name)