Enforce that apk_under_test is used

build/config/android/internal_rules.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 
 assert(is_android)
 
 rebased_android_sdk = rebase_path(android_sdk, root_build_dir)
 rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
@@ skipping 296 matching lines @@
       args += [
         "--resources-zip",
         rebase_path(invoker.resources_zip, root_build_dir),
       ]
       if (defined(invoker.android_manifest)) {
         inputs += [ invoker.android_manifest ]
         args += [
           "--android-manifest",
           rebase_path(invoker.android_manifest, root_build_dir),
         ]
+      } else {
+        assert(!is_apk, "apk build configs require an android_manifest")
       }
       if (defined(invoker.custom_package)) {
         args += [
           "--package-name",
           invoker.custom_package,
         ]
       }
     }
 
     if (is_apk) {
@@ skipping 825 matching lines @@
     ]
     output = invoker.dex_path
     dex_arg_key = "${rebased_build_config}:final_dex:dependency_dex_files"
     args = [ "--inputs=@FileArg($dex_arg_key)" ]
     if (defined(invoker.excluded_jars)) {
       excluded_jars = rebase_path(invoker.excluded_jars, root_build_dir)
       args += [ "--excluded-paths=${excluded_jars}" ]
     }
   }
 }