Add VideoEncoder.ScalingSettings.toString method.

Bug: None
Change-Id: Ib7563bdec49736b104d3cbb52a7c77b6aa142030
Reviewed-on: https://webrtc-review.googlesource.com/70500
Reviewed-by: Paulina Hensman <phensman@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22922}

sdk/android/tests/src/org/webrtc/ScalingSettingsTest.java

@@ -0,0 +1,29 @@
+/*
+ *  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 static org.junit.Assert.assertEquals;
+
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+import org.webrtc.VideoEncoder.ScalingSettings;
+
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class ScalingSettingsTest {
+  @Test
+  public void testToString() {
+    assertEquals("[ 1, 2 ]", new ScalingSettings(1, 2).toString());
+    assertEquals("OFF", ScalingSettings.OFF.toString());
+  }
+}