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/accounts/AccountSettings.java

@@ -134,7 +134,7 @@ public class AccountSettings extends SettingsPreferenceFragment
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.ACCOUNT;
     }
 

src/com/android/settings/accounts/AccountSyncSettings.java

@@ -145,7 +145,7 @@ public class AccountSyncSettings extends AccountPreferenceBase {
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.ACCOUNTS_ACCOUNT_SYNC;
     }
 

src/com/android/settings/accounts/ChooseAccountActivity.java

@@ -93,7 +93,7 @@ public class ChooseAccountActivity extends SettingsPreferenceFragment {
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.ACCOUNTS_CHOOSE_ACCOUNT_ACTIVITY;
     }
 

src/com/android/settings/accounts/ManageAccountsSettings.java

@@ -88,7 +88,7 @@ public class ManageAccountsSettings extends AccountPreferenceBase
     private Account mFirstAccount;
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsEvent.ACCOUNTS_MANAGE_ACCOUNTS;
     }
 

src/com/android/settings/accounts/ManagedProfileSettings.java

@@ -118,7 +118,7 @@ public class ManagedProfileSettings extends SettingsPreferenceFragment
     }
 
     @Override
-    protected int getMetricsCategory() {
+    public int getMetricsCategory() {
         return MetricsProto.MetricsEvent.ACCOUNTS_WORK_PROFILE_SETTINGS;
     }