command_buffer_gles2: Add test command_buffer_gles2_test for command_buffer_gles2

gpu/gles2_conform_support/egl/test_support.h

+// Copyright (c) 2016 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 GPU_GLES2_CONFORM_SUPPORT_EGL_TEST_SUPPORT_H_
+#define GPU_GLES2_CONFORM_SUPPORT_EGL_TEST_SUPPORT_H_
+
+namespace egl {
+
+// A variable used for detecting whether the test runner for EGL has the same
+// global variables as the dynamic library.
+bool g_command_buffer_gles2_has_atexit_manager;

[piman, 2016/02/02 16:47:48]

I think this needs to be in a .cc file, and exported as extern in a .h, to avoid
multiple definitions.  Or am I missing some subtle thing?

+
+} // namespace egl
+
+#endif