Add unit tests for hardware video codecs.

Bug: webrtc:9594
Change-Id: I4529a5123997e0309bde1b931bb6d99bea8c0dfd
Reviewed-on: https://webrtc-review.googlesource.com/92399
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24223}

sdk/android/src/java/org/webrtc/MediaCodecWrapper.java

@@ -0,0 +1,53 @@
+/*
+ *  Copyright 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 android.media.MediaCodec;
+import android.media.MediaCrypto;
+import android.media.MediaFormat;
+import android.os.Bundle;
+import android.view.Surface;
+import java.nio.ByteBuffer;
+
+/**
+ * Subset of methods defined in {@link android.media.MediaCodec} needed by
+ * {@link HardwareVideoEncoder} and {@link HardwareVideoDecoder}. This interface
+ * exists to allow mocking and using a fake implementation in tests.
+ */
+interface MediaCodecWrapper {
+  void configure(MediaFormat format, Surface surface, MediaCrypto crypto, int flags);
+
+  void start();
+
+  void flush();
+
+  void stop();
+
+  void release();
+
+  int dequeueInputBuffer(long timeoutUs);
+
+  void queueInputBuffer(int index, int offset, int size, long presentationTimeUs, int flags);
+
+  int dequeueOutputBuffer(MediaCodec.BufferInfo info, long timeoutUs);
+
+  void releaseOutputBuffer(int index, boolean render);
+
+  MediaFormat getOutputFormat();
+
+  ByteBuffer[] getInputBuffers();
+
+  ByteBuffer[] getOutputBuffers();
+
+  Surface createInputSurface();
+
+  void setParameters(Bundle params);
+}