Use default app certificate from Make

Bug: 69917341
Test: m checkbuild
Test: framework-res.apk is identical after converting to Soong
Change-Id: I6980afd94ea130740da0defeea045eddc2fc6439

android/config.go

@@ -491,11 +491,21 @@ func (c *config) ProductAAPTPrebuiltDPI() []string {
 }
 
 func (c *config) DefaultAppCertificateDir(ctx PathContext) SourcePath {
-	return PathForSource(ctx, "build/target/product/security")
+	defaultCert := String(c.ProductVariables.DefaultAppCertificate)
+	if defaultCert != "" {
+		return PathForSource(ctx, filepath.Dir(defaultCert))
+	} else {
+		return PathForSource(ctx, "build/target/product/security")
+	}
 }
 
 func (c *config) DefaultAppCertificate(ctx PathContext) SourcePath {
-	return c.DefaultAppCertificateDir(ctx).Join(ctx, "testkey")
+	defaultCert := String(c.ProductVariables.DefaultAppCertificate)
+	if defaultCert != "" {
+		return PathForSource(ctx, defaultCert)
+	} else {
+		return c.DefaultAppCertificateDir(ctx).Join(ctx, "testkey")
+	}
 }
 
 func (c *config) AllowMissingDependencies() bool {

android/variable.go

@@ -141,6 +141,8 @@ type productVariables struct {
 	AAPTPreferredConfig *string   `json:",omitempty"`
 	AAPTPrebuiltDPI     *[]string `json:",omitempty"`
 
+	DefaultAppCertificate *string `json:",omitempty"`
+
 	AppsDefaultVersionName *string `json:",omitempty"`
 
 	Allow_missing_dependencies *bool `json:",omitempty"`