Add Volume panel

Volume panel hosts each volume stream, including:
- Media volume
- Call Volume
- Ring volume
- Alarm volume

Change-Id: I1801d10d2304c57615e9499386c638c74ffcd7c3
Screenshot: https://screenshot.googleplex.com/m764j65ECto
Bug: 117804161
Test: Manual app
Test: robolectric

tests/robotests/src/com/android/settings/panel/PanelSlicesAdapterTest.java

@@ -54,7 +54,13 @@ public class PanelSlicesAdapterTest {
     public void setUp() {
         mContext = RuntimeEnvironment.application;
 
-        final ActivityController<FakeSettingsPanelActivity> activityController =
+        mPanelFeatureProvider = spy(new PanelFeatureProviderImpl());
+        mFakeFeatureFactory = FakeFeatureFactory.setupForTest();
+        mFakeFeatureFactory.panelFeatureProvider = mPanelFeatureProvider;
+        mFakePanelContent = new FakePanelContent();
+        doReturn(mFakePanelContent).when(mPanelFeatureProvider).getPanel(any(), any());
+
+        ActivityController<FakeSettingsPanelActivity> activityController =
                 Robolectric.buildActivity(FakeSettingsPanelActivity.class);
         activityController.setup();
 
@@ -65,12 +71,6 @@ public class PanelSlicesAdapterTest {
                                 .getSupportFragmentManager()
                                 .findFragmentById(R.id.main_content));
 
-        mPanelFeatureProvider = spy(new PanelFeatureProviderImpl());
-        mFakeFeatureFactory = FakeFeatureFactory.setupForTest();
-        mFakeFeatureFactory.panelFeatureProvider = mPanelFeatureProvider;
-        mFakePanelContent = new FakePanelContent();
-        doReturn(mFakePanelContent).when(mPanelFeatureProvider).getPanel(any(), any());
-
         mAdapter = new PanelSlicesAdapter(mPanelFragment, mFakePanelContent.getSlices());
     }