Migrate AudioFocusChangeListener to browser and always send GAIN

content/public/android/javatests/src/org/chromium/content/browser/AudioFocusManagerTest.java

Index: content/public/android/javatests/src/org/chromium/content/browser/AudioFocusManagerTest.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/AudioFocusManagerTest.java b/content/public/android/javatests/src/org/chromium/content/browser/AudioFocusManagerTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..12cb96f1aa4bfb9408ec837a6ebf4fb4dac68334
--- /dev/null
+++ b/content/public/android/javatests/src/org/chromium/content/browser/AudioFocusManagerTest.java
@@ -0,0 +1,99 @@
+// 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.
+
+package org.chromium.content.browser;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.media.AudioManager.OnAudioFocusChangeListener;
+import android.test.suitebuilder.annotation.MediumTest;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.content.browser.test.util.DOMUtils;
+import org.chromium.content_shell_apk.ContentShellTestBase;
+
+/**
+ * Test AudioFocus behavior between Chromium and external media players.
+ */
+public class AudioFocusManagerTest extends ContentShellTestBase {
+    private static final String MULTIPLE_AUDIO_TEST_URL =
+            "content/test/data/android/multiple_audio_test.html";
+    private static final String FIRST_AUDIO_ID = "firstAudio";
+    private static final String SECOND_AUDIO_ID = "secondAudio";
+    private static final String PLAY_FIRST_BUTTON = "playFirstButton";
+    private static final String PLAY_SECOND_BUTTON = "playSecondButton";
+    private static final String PAUSE_FIRST_BUTTON = "pauseFirstButton";
+    private static final String PAUSE_SECOND_BUTTON = "pauseSecondButton";
+    private static final String REDUCE_FIRST_VOLUME_BUTTON = "reduceFirstVolumeButton";
+    private static final String RESET_FIRST_VOLUME_BUTTON = "resetFirstVolumeButton";
+
+    private OnAudioFocusChangeListener mExternalAFChangeListener;
+    private AudioManager mAudioManager;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+
+        try {
+            startActivityWithTestUrl(MULTIPLE_AUDIO_TEST_URL);
+        } catch (Throwable t) {
+            fail("Could not load test page: " + MULTIPLE_AUDIO_TEST_URL);
+        }
+
+        // Setup an AudioFocusChangeListener to mimic an external app.
+        mExternalAFChangeListener = new OnAudioFocusChangeListener() {
+            @Override
+            public void onAudioFocusChange(int focusChange) {
+            }
+        };
+        mAudioManager = (AudioManager) getInstrumentation().getTargetContext().getSystemService(
+                Context.AUDIO_SERVICE);
+    }
+
+    @MediumTest
+    @Feature({"Browser"})
+    public void testInterruption() throws Throwable {
+        // Play two audio elements.
+        tapButton(PLAY_FIRST_BUTTON);
+        assertTrue("First audio element did not start",
+                   DOMUtils.waitForVideoState(getWebContents(),
+                                              FIRST_AUDIO_ID,
+                                              DOMUtils.VIDEO_STATE_PLAYING));
+        tapButton(PLAY_SECOND_BUTTON);
+        assertTrue("Second audio element did not start",
+                   DOMUtils.waitForVideoState(getWebContents(),
+                                              SECOND_AUDIO_ID,
+                                              DOMUtils.VIDEO_STATE_PLAYING));
+
+        // Request audio focus away from webpage audio with DUCK.
+        mAudioManager.requestAudioFocus(mExternalAFChangeListener,
+                                        AudioManager.STREAM_MUSIC,
+                                        AudioManager.AUDIOFOCUS_GAIN);
+
+        // Audio in page should be stopped.
+        assertTrue("First audio element did not stop after losing audio focus",
+                   DOMUtils.waitForVideoState(getWebContents(),
+                                              FIRST_AUDIO_ID,
+                                              DOMUtils.VIDEO_STATE_PAUSED));
+        assertTrue("Second audio element did not stop after losing audio focus",
+                   DOMUtils.waitForVideoState(getWebContents(),
+                                              SECOND_AUDIO_ID,
+                                              DOMUtils.VIDEO_STATE_PAUSED));
+
+        // Restart one of the audio elements.
+        tapButton(PLAY_FIRST_BUTTON);
+        assertTrue("First audio element did not resume after calling play",
+                   DOMUtils.waitForVideoState(getWebContents(),
+                                              FIRST_AUDIO_ID,
+                                              DOMUtils.VIDEO_STATE_PLAYING));
+        assertTrue("Second audio element resumed without calling play on first",
+                   DOMUtils.isVideoPaused(getWebContents(), SECOND_AUDIO_ID));
+
+        mAudioManager.abandonAudioFocus(mExternalAFChangeListener);
+    }
+
+    private void tapButton(String button) throws Exception {
+        DOMUtils.clickNode(this, getContentViewCore(), button);
+    }
+}