Add debug output to extract

Author: jonsimantov

android_build_files/extract_and_dex.gradle

@@ -61,6 +61,11 @@ def defineExtractionTasks(String resourceName, String buildType) {
       String dex_path = "${sdk_dir}/build-tools/${buildToolsVersion}/d8"
       if (org.gradle.internal.os.OperatingSystem.current().isWindows()) {
         dex_path = "${dex_path}.bat"
+
+        commandLine "cmd", "/c", "echo", "${dex_path}",
+            "$buildDir/classes.jar",
+            "--output",
+            "$dexedJar"
       }
 
       commandLine "${dex_path}",