Update SoundSettings to extend DashboardFragment.

- initial round of refactoring SoundSettings to use DashboardFragment.
- add controller for Cast, Do not disturb, Alarm volume, Media volume,
  Ring volume and Notification volume.

Bug: 32276590
Test: make RunSettingsRoboTests
Change-Id: I5c02a344bff5117bfce93d7ccac650fccc82d2b0

tests/robotests/src/com/android/settings/notification/MediaVolumePreferenceControllerTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.notification;
+
+import android.content.Context;
+import android.media.AudioManager;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class MediaVolumePreferenceControllerTest {
+
+    @Mock
+    private Context mContext;
+
+    private MediaVolumePreferenceController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = new MediaVolumePreferenceController(mContext, null, null);
+    }
+
+    @Test
+    public void isAlwaysAvailable() {
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    public void getAudioStream_shouldReturnMusic() {
+        assertThat(mController.getAudioStream()).isEqualTo(AudioManager.STREAM_MUSIC);
+    }
+
+}