Prepare D8 dexing tests for Java 11

Test was compiling .class files separately without any classes on classpath. As there where classes in nests that failed when compiled with Java 11.

Fixed by passing all input as classpath.

RELNOTES: None
PiperOrigin-RevId: 360121530

src/tools/android/java/com/google/devtools/build/android/r8/CompatDexBuilder.java

@@ -163,7 +163,7 @@ private void run(String[] args) throws IOException, InterruptedException, Execut
 
         List<Future<DexConsumer>> futures = new ArrayList<>(toDex.size());
         for (ZipEntry classEntry : toDex) {
-          futures.add(executor.submit(() -> dexEntry(zipFile, classEntry, executor)));
+          futures.add(executor.submit(() -> dexEntry(input, zipFile, classEntry, executor)));
         }
         for (int i = 0; i < futures.size(); i++) {
           ZipEntry entry = toDex.get(i);
@@ -176,11 +176,13 @@ private void run(String[] args) throws IOException, InterruptedException, Execut
     }
   }
 
-  private DexConsumer dexEntry(ZipFile zipFile, ZipEntry classEntry, ExecutorService executor)
+  private DexConsumer dexEntry(
+      String classpath, ZipFile zipFile, ZipEntry classEntry, ExecutorService executor)
       throws IOException, CompilationFailedException {
     DexConsumer consumer = new DexConsumer();
     D8Command.Builder builder = D8Command.builder();
     builder
+        .addClasspathFiles(Paths.get(classpath))
         .setProgramConsumer(consumer)
         .setMode(noLocals ? CompilationMode.RELEASE : CompilationMode.DEBUG)
         .setMinApiLevel(13) // H_MR2.