Add logging for SettingsPanels

The 3 main categories are:
- Panel Opened
- Panel Closed
- Panel Slice interaction

There are 3 close events:
- See more button
- Done button
- Clicking outside the panel

Slice interactions will log the Uri of the Slice and the ActionType,
such as Toggle, Slider, Content (intent).

Change-Id: Iecad948f39f50dd12ae1bcb23a5d523e0df8bb98
Fixes: 117804231
Test: robotests

src/com/android/settings/panel/VolumePanel.java

@@ -21,6 +21,7 @@ import static com.android.settings.slices.CustomSliceRegistry.VOLUME_CALL_URI;
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_MEDIA_URI;
 import static com.android.settings.slices.CustomSliceRegistry.VOLUME_RINGER_URI;
 
+import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
@@ -62,4 +63,9 @@ public class VolumePanel implements PanelContent {
     public Intent getSeeMoreIntent() {
         return new Intent(Settings.ACTION_SOUND_SETTINGS);
     }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.PANEL_VOLUME;
+    }
 }