Put generated non-test Java runner scripts into bin/

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/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
@@ skipping 953 matching lines @@
     test_type = "junit"
   }
 
   java_binary(_java_binary_target_name) {
     deps = []
     jar_name = invoker.target_name
     forward_variables_from(invoker, "*")
     testonly = true
     bypass_platform_checks = true
     main_class = "org.chromium.testing.local.JunitTestMain"
+    used_only_by_tests = true

[agrieve, 2016/02/18 20:52:19]

Sorry to be pedantic, but looking at this now, I'm afraid it might be confusing
with the existing "test_only" variable (e.g. what's the difference between
test_only and used_only_by_tests).

Would it work instead to set wrapper_script_name = "helpers/$target_name"?

[mikecase (-- gone --), 2016/02/18 21:31:47]

Yep, I didn't give much thought to the variable name used_only_by_tests. Changed
to just set the wrapper_script_name. This works pretty well. It's kinda messy
for gyp
since I didn't see a better way than to just set wrapper_script_name for every
junit test target. But since GN seems to be soon replacing GYP everywhere this
is probably fine.

     wrapper_script_name = "$target_name"
 
     deps += [
       "//testing/android/junit:junit_test_support",
       "//third_party/junit",
       "//third_party/mockito:mockito_java",
       "//third_party/robolectric:android-all-4.3_r2-robolectric-0",
       "//third_party/robolectric:robolectric_java",
     ]
   }
@@ skipping 1432 matching lines @@
       "--target",
       rebase_path(invoker.target, root_build_dir),
       "--output-directory",
       rebase_path(root_out_dir, root_build_dir),
     ]
     if (defined(invoker.flag_name)) {
       args += [ "--flag-name=${invoker.flag_name}" ]
     }
   }
 }