Turn test runner library into an actual component

components/test_runner/test_runner_export.h

Index: components/test_runner/test_runner_export.h
diff --git a/components/test_runner/test_runner_export.h b/components/test_runner/test_runner_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..ea096e8c2b0893debe91d0304314ac120d807eba
--- /dev/null
+++ b/components/test_runner/test_runner_export.h
@@ -0,0 +1,29 @@
+// Copyright 2015 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.
+
+#ifndef COMPONENTS_TEST_RUNNER_TEST_RUNNER_EXPORT_H_
+#define COMPONENTS_TEST_RUNNER_TEST_RUNNER_EXPORT_H_
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(TEST_RUNNER_IMPLEMENTATION)
+#define TEST_RUNNER_EXPORT __declspec(dllexport)
+#else
+#define TEST_RUNNER_EXPORT __declspec(dllimport)
+#endif  // defined(TEST_RUNNER_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(TEST_RUNNER_IMPLEMENTATION)
+#define TEST_RUNNER_EXPORT __attribute__((visibility("default")))
+#else
+#define TEST_RUNNER_EXPORT
+#endif
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define TEST_RUNNER_EXPORT
+#endif
+
+#endif  // COMPONENTS_TEST_RUNNER_TEST_RUNNER_EXPORT_H_