LibYuv GN: Add GN test targets.

build_overrides/gtest.gni

Index: build_overrides/gtest.gni
diff --git a/build_overrides/gtest.gni b/build_overrides/gtest.gni
new file mode 100644
index 0000000000000000000000000000000000000000..d3c3f68cef1e0cd16f58558910e3c2528c6dd4da
--- /dev/null
+++ b/build_overrides/gtest.gni
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+# Copyright (c) 2016 The LibYuv project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# Include support for registering main function in multi-process tests.
+gtest_include_multiprocess = true
+
+# Include support for platform-specific operations across unit tests.
+gtest_include_platform_test = true
+
+# Exclude support for testing Objective C code on OS X and iOS.
+gtest_include_objc_support = true
+
+# Exclude support for flushing coverage files on iOS.
+gtest_include_ios_coverage = true