Adding third_party/openh264/src, build files and unittests

third_party/openh264/testing/openh264_testing.gyp

+# 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.
+
+{
+  'conditions': [
+    ['build_openh264==1', {
+      # Building with OpenH264.
+      'targets': [
+        {
+          'target_name': 'openh264_testing',
+          'type': 'static_library',
+          'include_dirs': [
+            '<(DEPTH)',
+          ],
+          'dependencies': [
+            '<(DEPTH)/testing/gtest.gyp:gtest',
+            '<(DEPTH)/third_party/webrtc/common_video/common_video.gyp:common_video',
+            '../openh264.gyp:openh264_encoder',
+            '../openh264.gyp:openh264_decoder',
+          ],
+          'sources': [
+            'i420_utils.cc',
+            'i420_utils.h',
+            'h264_codec_tester.cc',
+            'h264_codec_tester.h',
+            'h264_encoder_impl.cc',
+            'h264_encoder_impl.h',
+            'h264_decoder_impl.cc',
+            'h264_decoder_impl.h',
+          ],
+        },
+      ],
+    },{
+      # Building without OpenH264. Defining a dummy target because every build
+      # file needs to have at least one target.
+      'targets': [
+        {
+          'target_name': 'openh264_testing_dummy_target',
+          'type': 'none',
+        }
+      ],
+    }],
+  ],
+}