GN: Make the wrapper script generated for junit work without extra args

build/config/android/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("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 778 matching lines @@
 }
 
 # Declare a Java executable target
 #
 # This target creates an executable from java code and libraries. The executable
 # will be in the output folder's /bin/ directory.
 #
 # Variables
 #   deps: Specifies the dependencies of this target. Java targets in this list
 #     will be included in the executable (and the javac classpath).
-#
 #   java_files: List of .java files included in this library.
 #   srcjar_deps: List of srcjar dependencies. The .java files in the srcjars
 #     will be added to java_files and be included in this library.
 #   srcjars: List of srcjars to be included in this library, together with the
 #     ones obtained from srcjar_deps.
-#
 #   bypass_platform_checks: Disables checks about cross-platform (Java/Android)
 #     dependencies for this target. This will allow depending on an
 #     android_library target, for example.
-#
 #   chromium_code: If true, extra analysis warning/errors will be enabled.
 #   enable_errorprone: If true, enables the errorprone compiler.
+#   main_class: When specified, a wrapper script is created within
+#     $target_out_dir/bin to launch the binary with the given class as the
+#     entrypoint.
+#   wrapper_script_args: List of additional arguments for the wrapper script.
 #
 #   data_deps, testonly
 #
 # Example
 #   java_binary("foo") {
 #     java_files = [ "org/chromium/foo/FooMain.java" ]
 #     deps = [ ":bar_java" ]
 #     main_class = "org.chromium.foo.FooMain"
 #   }
 template("java_binary") {
@@ skipping 31 matching lines @@
 #     deps = [ ":bar_java" ]
 #   }
 template("junit_binary") {
   set_sources_assignment_filter([])
 
   java_binary(target_name) {
     deps = []
     forward_variables_from(invoker, "*")
     bypass_platform_checks = true
     main_class = "org.chromium.testing.local.JunitTestMain"
+    wrapper_script_args = [
+      "-test-jars",
+      "$target_name.jar",
+    ]
     testonly = true
 
     deps += [
       "//testing/android/junit:junit_test_support",
       "//third_party/junit",
       "//third_party/mockito:mockito_java",
       "//third_party/robolectric:robolectric_java",
       "//third_party/robolectric:android-all-4.3_r2-robolectric-0",
     ]
   }
@@ skipping 1132 matching lines @@
 
 # TODO(GYP): implement this.
 template("uiautomator_test") {
   set_sources_assignment_filter([])
   forward_variables_from(invoker, [ "testonly" ])
   assert(target_name != "")
   assert(invoker.deps != [] || true)
   group(target_name) {
   }
 }