[Android] Generate scripts at build time to run android tests.

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 1359 matching lines @@
     script = "//build/android/gyp/generate_split_manifest.py"
     outputs = [
       depfile,
       invoker.out_manifest,
     ]
     inputs = [
       invoker.main_manifest,
     ]
   }
 }
+
+# Generates a script in the output bin directory which runs the test
+# target using the test runner script in build/android/test_runner.py.
+template("test_runner_script") {
+  testonly = true
+  _test_name = invoker.test_name
+  _test_type = invoker.test_type
+
+  action(target_name) {
+    script = "//build/android/gyp/create_test_runner_script.py"
+    depfile = "$target_gen_dir/$target_name.d"
+
+    test_runner_args = [
+      _test_type,
+      "--output-directory",
+      rebase_path(root_build_dir, root_build_dir),
+    ]
+    if (_test_type == "gtest") {
+      assert(defined(invoker.test_suite))
+      test_runner_args += [
+        "--suite",
+        invoker.test_suite,
+      ]
+    } else if (_test_type == "instrumentation") {
+      assert(defined(invoker.test_apk))
+      test_runner_args += [
+        "--test-apk",
+        invoker.test_apk,
+      ]
+    } else {
+      assert(false, "Invalid test type: $_test_type.")
+    }
+
+    if (defined(invoker.isolate_file)) {
+      test_runner_args += [
+        "--isolate-file-path",
+        rebase_path(invoker.isolate_file, root_build_dir),
+      ]
+    }
+
+    generated_script = "$root_build_dir/bin/run_${_test_name}"
+    outputs = [
+      depfile,
+      generated_script,
+    ]
+    args = [
+      "--depfile",
+      rebase_path(depfile, root_build_dir),
+      "--script-output-path",
+      rebase_path(generated_script, root_build_dir),
+    ]
+    args += test_runner_args
+  }
+}