Add a prefix to visited tab preferences keys

This makes it easy to identify and backup visited tab
preferences

Bug: 130304311
Change-Id: I22688a623286ae3ec605a4a3fa3f3e1c13a5e823
diff --git a/src/com/android/customization/module/CustomizationPreferences.java b/src/com/android/customization/module/CustomizationPreferences.java
index 0c09826..dc7662c 100644
--- a/src/com/android/customization/module/CustomizationPreferences.java
+++ b/src/com/android/customization/module/CustomizationPreferences.java
@@ -20,6 +20,7 @@
 public interface CustomizationPreferences extends WallpaperPreferences {
 
     String KEY_CUSTOM_THEME= "themepicker_custom_theme";
+    String KEY_VISITED_PREFIX = "themepicker_visited_";
 
     String getSerializedCustomTheme();
 
diff --git a/src/com/android/customization/module/DefaultCustomizationPreferences.java b/src/com/android/customization/module/DefaultCustomizationPreferences.java
index cd3cc2d..202ff49 100644
--- a/src/com/android/customization/module/DefaultCustomizationPreferences.java
+++ b/src/com/android/customization/module/DefaultCustomizationPreferences.java
@@ -39,11 +39,11 @@
 
     @Override
     public boolean getTabVisited(String id) {
-        return mSharedPrefs.getBoolean(id, false);
+        return mSharedPrefs.getBoolean(KEY_VISITED_PREFIX + id, false);
     }
 
     @Override
     public void setTabVisited(String id) {
-        mSharedPrefs.edit().putBoolean(id, true).apply();
+        mSharedPrefs.edit().putBoolean(KEY_VISITED_PREFIX + id, true).apply();
     }
 }