Allow for overriding container packagename for an Apex.

Test: go test ./... -test.v -run TestOverrideApex
BUG: 148198056
Change-Id: If49042a7acbf9f0dcb505664863d97805902e459

apex/apex.go

@@ -1359,6 +1359,10 @@ type overridableProperties struct {
 
 	// Logging Parent value
 	Logging_parent string
+
+	// Apex Container Package Name.
+	// Override value for attribute package:name in AndroidManifest.xml
+	Package_name string
 }
 
 type apexPackaging int

apex/apex_test.go

@@ -3664,6 +3664,7 @@ func TestOverrideApex(t *testing.T) {
 			apps: ["override_app"],
 			overrides: ["unknownapex"],
 			logging_parent: "com.foo.bar",
+			package_name: "test.overridden.package",
 		}
 
 		apex_key {
@@ -3715,7 +3716,7 @@ func TestOverrideApex(t *testing.T) {
 	}
 
 	optFlags := apexRule.Args["opt_flags"]
-	ensureContains(t, optFlags, "--override_apk_package_name com.android.myapex")
+	ensureContains(t, optFlags, "--override_apk_package_name test.overridden.package")
 
 	data := android.AndroidMkDataForTest(t, config, "", apexBundle)
 	var builder strings.Builder

apex/builder.go

@@ -657,6 +657,9 @@ func (a *apexBundle) getOverrideManifestPackageName(ctx android.ModuleContext) s
 		}
 		return ""
 	}
+	if a.overridableProperties.Package_name != "" {
+		return a.overridableProperties.Package_name
+	}
 	manifestPackageName, overridden := ctx.DeviceConfig().OverrideManifestPackageNameFor(ctx.ModuleName())
 	if overridden {
 		return manifestPackageName