Add GN isolate support for a bunch of unittests.

sandbox/linux/BUILD.gn

 # 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/features.gni")
 import("//testing/test.gni")
 
 declare_args() {
   compile_suid_client = is_linux
 
@@ skipping 128 matching lines @@
     if (use_base_test_suite) {
       # Tests that use advanced features not available in stock GTest.
       sources += [ "services/namespace_sandbox_unittest.cc" ]
     }
 
     # For credentials_unittest.cc
     configs += [ "//build/config/linux:libcap" ]
   }
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("sandbox_linux_unittests_run") {
+  testonly = true
+  deps = [
+    ":sandbox_linux_unittests",
+  ]
+}
+
 # The main sandboxing test target.
 test("sandbox_linux_unittests") {
   deps = [
     ":sandbox_linux_unittests_sources",
   ]
 }
 
 # This target is the shared library used by Android APK (i.e.
 # JNI-friendly) tests.
 shared_library("sandbox_linux_jni_unittests") {
@@ skipping 214 matching lines @@
   #      'type': 'none',
   #      'variables': {
   #        'test_suite_name': 'sandbox_linux_jni_unittests',
   #      },
   #      'dependencies': [
   #        'sandbox_linux_jni_unittests',
   #      ],
   #      'includes': [ '../../build/apk_test.gypi' ],
   #      }
 }