Log visibility change for all fragments.

Bug: 30681771
Test: SettingsUnitTests

Refactor visibility logging from InstrumentedFragment into a mixin. And
apply mixin in remaining fragments.

Change-Id: Ibbb59904336254a3e4bb9e8c7d0b36e5a6bc2622

src/com/android/settings/fuelgauge/BatteryHistoryDetail.java

@@ -119,7 +119,7 @@ public class BatteryHistoryDetail extends SettingsPreferenceFragment {
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.FUELGAUGE_BATTERY_HISTORY_DETAIL;
     }
 }

src/com/android/settings/fuelgauge/BatterySaverSettings.java

@@ -65,7 +65,7 @@ public class BatterySaverSettings extends SettingsPreferenceFragment
     private PowerManager mPowerManager;
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.FUELGAUGE_BATTERY_SAVER;
     }
 

src/com/android/settings/fuelgauge/InactiveApps.java

@@ -37,7 +37,7 @@ public class InactiveApps extends SettingsPreferenceFragment implements OnPrefer
     private UsageStatsManager mUsageStats;
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.FUELGAUGE_INACTIVE_APPS;
     }
 

src/com/android/settings/fuelgauge/PowerUsageDetail.java

@@ -359,7 +359,7 @@ public class PowerUsageDetail extends PowerUsageBase implements Button.OnClickLi
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.FUELGAUGE_POWER_USAGE_DETAIL;
     }
 

src/com/android/settings/fuelgauge/PowerUsageSummary.java

@@ -90,7 +90,7 @@ public class PowerUsageSummary extends PowerUsageBase {
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.FUELGAUGE_POWER_USAGE_SUMMARY;
     }