Add unit test for JavaToNativeVideoCodecInfo.

Bug: webrtc:9495
Change-Id: I8f667f81754ed299a99ddc85af8ee73b148a2335
Reviewed-on: https://webrtc-review.googlesource.com/87580
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23885}

sdk/android/native_unittests/org/webrtc/CodecsWrapperTestHelper.java

@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2018 The WebRTC 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.
+ */
+
+package org.webrtc;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class CodecsWrapperTestHelper {
+  @CalledByNative
+  public static VideoCodecInfo createTestVideoCodecInfo() {
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(
+        VideoCodecInfo.H264_FMTP_PROFILE_LEVEL_ID, VideoCodecInfo.H264_CONSTRAINED_BASELINE_3_1);
+
+    VideoCodecInfo codec_info = new VideoCodecInfo("H264", params);
+    return codec_info;
+  }
+}