Add classpath fragment property to skip proto generation.

This must always be true for updatable apexes, but is not necessary
for non-updatable apexes like com.android.i18n.

In a follow up this will be used to figure out whether apex boot jars
should be bundled into platform_bootclasspath.

Bug: 191127295
Test: atest CtsClasspathsTestCases derive_classpath_test
Change-Id: Ib7dc5b057cb24955222fb97f3ff9da079f30ed77
Merged-In: Ib7dc5b057cb24955222fb97f3ff9da079f30ed77

apex/apex_test.go

@@ -6666,6 +6666,47 @@ func TestUpdatableDefault_should_set_min_sdk_version(t *testing.T) {
 	`)
 }
 
+func TestUpdatable_should_not_set_generate_classpaths_proto(t *testing.T) {
+	testApexError(t, `"mysystemserverclasspathfragment" .* it must not set generate_classpaths_proto to false`, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			systemserverclasspath_fragments: [
+				"mysystemserverclasspathfragment",
+			],
+			min_sdk_version: "29",
+			updatable: true,
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		java_library {
+			name: "foo",
+			srcs: ["b.java"],
+			min_sdk_version: "29",
+			installable: true,
+			apex_available: [
+				"myapex",
+			],
+		}
+
+		systemserverclasspath_fragment {
+			name: "mysystemserverclasspathfragment",
+			generate_classpaths_proto: false,
+			contents: [
+				"foo",
+			],
+			apex_available: [
+				"myapex",
+			],
+		}
+	`)
+}
+
 func TestNoUpdatableJarsInBootImage(t *testing.T) {
 	// Set the BootJars in dexpreopt.GlobalConfig and productVariables to the same value. This can
 	// result in an invalid configuration as it does not set the ArtApexJars and allows art apex