Add gn_unittests to linux bots.

BUG=364645
TEST=trybots
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1002353002

Cr-Commit-Position: refs/heads/master@{#322111}

testing/buildbot/chromium.linux.json

 {
   "Linux Tests": {
     "gtest_tests": [
+      "gn_unittests",
       {
         "test": "accessibility_unittests",
         "swarming": {
@@ -195,6 +196,7 @@
   },
   "Linux Tests (dbg)(1)(32)": {
     "gtest_tests": [
+      "gn_unittests",
       {
         "test": "accessibility_unittests",
         "swarming": {
@@ -363,6 +365,7 @@
   },
   "Linux Tests (dbg)(1)": {
     "gtest_tests": [
+      "gn_unittests",
       {
         "test": "accessibility_unittests",
         "swarming": {
@@ -543,6 +546,7 @@
   },
   "Linux Clang (dbg)": {
     "gtest_tests": [
+      "gn_unittests",
       "accessibility_unittests",
       "app_shell_unittests",
       "base_unittests",

tools/gn/BUILD.gn

@@ -255,7 +255,6 @@ test("gn_unittests") {
     "parser_unittest.cc",
     "path_output_unittest.cc",
     "pattern_unittest.cc",
-    "run_all_unittests.cc",
     "scope_per_file_provider_unittest.cc",
     "scope_unittest.cc",
     "source_dir_unittest.cc",
@@ -274,6 +273,7 @@ test("gn_unittests") {
   ]
   deps = [
     ":gn_lib",
+    "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gtest",
   ]

tools/gn/gn.gyp

@@ -232,7 +232,6 @@
         'parser_unittest.cc',
         'path_output_unittest.cc',
         'pattern_unittest.cc',
-        'run_all_unittests.cc',
         'scope_per_file_provider_unittest.cc',
         'scope_unittest.cc',
         'source_dir_unittest.cc',
@@ -251,6 +250,7 @@
       ],
       'dependencies': [
         'gn_lib',
+        '../../base/base.gyp:run_all_unittests',
         '../../base/base.gyp:test_support_base',
         '../../testing/gtest.gyp:gtest',
       ],

tools/gn/run_all_unittests.cc

-// 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.
-
-#include "base/test/test_suite.h"
-
-// Don't use the multiprocess test harness. This test suite is fast enough and
-// it makes the output more difficult to read.
-int main(int argc, char** argv) {
-  base::TestSuite test_suite(argc, argv);
-  return test_suite.Run();
-}