[Settings] Add pref key for metrics

Bug: 349749793
Test: manual
Flag: EXEMPT resource only update
Change-Id: I367a42d023b2a1b879130e63205e3f63365a4a86

res/xml/language_settings.xml

@@ -18,7 +18,8 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/languages_settings">
+    android:title="@string/languages_settings"
+    android:key="languages_settings">
     <PreferenceCategory
         android:key="languages_category"
         android:title="@string/locale_picker_category_title">

res/xml/languages.xml

@@ -18,7 +18,8 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/language_picker_title">
+    android:title="@string/language_picker_title"
+    android:key="system_languages">
 
     <com.android.settingslib.widget.TopIntroPreference
         android:title="@string/desc_introduction_of_language_picker"

res/xml/regional_preference_main_page.xml

@@ -16,7 +16,8 @@
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/regional_preferences_title">
+    android:title="@string/regional_preferences_title"
+    android:key="regional_preferences">
 
     <com.android.settingslib.widget.TopIntroPreference
         android:title="@string/regional_preferences_main_page_sub_title"

res/xml/regional_preference_numbering_system_page.xml

@@ -13,4 +13,6 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" />
+<PreferenceScreen
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:key="regional_preference_numbering_system"/>

res/xml/regional_preferences_first_day_of_week.xml

@@ -17,7 +17,8 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/first_day_of_week_preferences_title">
+    android:title="@string/first_day_of_week_preferences_title"
+    android:key="regional_preference_first_day_of_week">
 
     <com.android.settingslib.widget.TopIntroPreference
         android:title="@string/regional_preferences_option_page_sub_title"

res/xml/regional_preferences_temperature.xml

@@ -17,7 +17,8 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/temperature_preferences_title">
+    android:title="@string/temperature_preferences_title"
+    android:key="regional_preference_temperature">
 
     <com.android.settingslib.widget.TopIntroPreference
         android:title="@string/regional_preferences_option_page_sub_title"

res/xml/terms_of_address.xml

@@ -17,7 +17,8 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
-    android:title="@string/terms_of_address_title">
+    android:title="@string/terms_of_address_title"
+    android:key="terms_of_address">
 
     <com.android.settingslib.widget.TopIntroPreference
         android:title="@string/terms_of_address_intro_title"