Adding third_party/openh264/src, build files and unittests

third_party/openh264/testing/BUILD.gn

Index: third_party/openh264/testing/BUILD.gn
diff --git a/third_party/openh264/testing/BUILD.gn b/third_party/openh264/testing/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..6d69c89b0ae01403ddc57fb2f9307a3e04b1d778
--- /dev/null
+++ b/third_party/openh264/testing/BUILD.gn
@@ -0,0 +1,26 @@
+# 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.
+
+import("//build/config/features.gni")
+
+if (build_openh264) {
+  static_library("openh264_testing") {
+    deps = [
+      "//third_party/webrtc/common_video:common_video",
+      "//third_party/openh264:openh264_encoder",
+      "//third_party/openh264:openh264_decoder",
+    ]
+    include_dirs = [ "//" ]
+    sources = [
+      "h264_codec_tester.cc",
+      "h264_codec_tester.h",
+      "h264_decoder_impl.cc",
+      "h264_decoder_impl.h",
+      "h264_encoder_impl.cc",
+      "h264_encoder_impl.h",
+      "i420_utils.cc",
+      "i420_utils.h",
+    ]
+  }
+}