Add seek forward/backward controls in MediaNotification

chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationButtonComputationTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationButtonComputationTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationButtonComputationTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationButtonComputationTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..656aa20cb290988bc6cb1692e400e004a96aac49
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationButtonComputationTest.java
@@ -0,0 +1,96 @@
+// Copyright 2016 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.
+
+package org.chromium.chrome.browser.media.ui;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.blink.mojom.MediaSessionAction;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+
+import java.util.ArrayList;
+
+/**
+ * Robolectric tests for compact view button computation in {@link MediaNotificationManager}.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config
+public class MediaNotificationButtonComputationTest {
+    @Test
+    @Feature({"MediaNotification"})
+    public void testLessThanThreeActionsWillBeAllShownInCompactView() {
+        ArrayList<Integer> actions = new ArrayList<Integer>();

[gone, 2016/11/28 19:23:21]

new ArrayList<>();

[Zhiqiang Zhang (Slow), 2016/11/29 16:45:40]

Done.

+        actions.add(MediaSessionAction.NEXT_TRACK);
+        actions.add(MediaSessionAction.SEEK_FORWARD);
+        actions.add(MediaSessionAction.PLAY);
+
+        int[] compactViewActions =
+                MediaNotificationManager.computeCompactViewActionIndices(actions);
+
+        assertEquals(3, compactViewActions.length);
+        assertEquals(0, compactViewActions[0]);
+        assertEquals(1, compactViewActions[1]);
+        assertEquals(2, compactViewActions[2]);
+    }
+
+    @Test
+    @Feature({"MediaNotification"})
+    public void testCompactViewPrefersActionPairs_SwitchTrack() {
+        ArrayList<Integer> actions = new ArrayList<Integer>();
+        actions.add(MediaSessionAction.PREVIOUS_TRACK);
+        actions.add(MediaSessionAction.NEXT_TRACK);
+        actions.add(MediaSessionAction.SEEK_FORWARD);
+        actions.add(MediaSessionAction.PLAY);
+
+        int[] compactViewActions =
+                MediaNotificationManager.computeCompactViewActionIndices(actions);
+
+        assertEquals(3, compactViewActions.length);
+        assertEquals(0, compactViewActions[0]);
+        assertEquals(3, compactViewActions[1]);
+        assertEquals(1, compactViewActions[2]);
+    }
+
+    @Test
+    @Feature({"MediaNotification"})
+    public void testCompactViewPrefersActionPairs_Seek() {
+        ArrayList<Integer> actions = new ArrayList<Integer>();
+        actions.add(MediaSessionAction.NEXT_TRACK);
+        actions.add(MediaSessionAction.SEEK_BACKWARD);
+        actions.add(MediaSessionAction.SEEK_FORWARD);
+        actions.add(MediaSessionAction.PLAY);
+
+        int[] compactViewActions =
+                MediaNotificationManager.computeCompactViewActionIndices(actions);
+
+        assertEquals(3, compactViewActions.length);
+        assertEquals(1, compactViewActions[0]);
+        assertEquals(3, compactViewActions[1]);
+        assertEquals(2, compactViewActions[2]);
+    }
+
+    @Test
+    @Feature({"MediaNotification"})
+    public void testCompactViewPreferSwitchTrackWhenBothPairsExist() {
+        ArrayList<Integer> actions = new ArrayList<Integer>();
+        actions.add(MediaSessionAction.PREVIOUS_TRACK);
+        actions.add(MediaSessionAction.NEXT_TRACK);
+        actions.add(MediaSessionAction.SEEK_BACKWARD);
+        actions.add(MediaSessionAction.SEEK_FORWARD);
+        actions.add(MediaSessionAction.PLAY);
+
+        int[] compactViewActions =
+                MediaNotificationManager.computeCompactViewActionIndices(actions);
+
+        assertEquals(3, compactViewActions.length);
+        assertEquals(0, compactViewActions[0]);
+        assertEquals(4, compactViewActions[1]);
+        assertEquals(1, compactViewActions[2]);
+    }
+}