Pref service: add support for tracked prefs.

components/user_prefs/tracked/pref_hash_filter.h

Index: components/user_prefs/tracked/pref_hash_filter.h
diff --git a/components/user_prefs/tracked/pref_hash_filter.h b/components/user_prefs/tracked/pref_hash_filter.h
index d7addb9ee18709df9b28c613d47575c087ef5a68..5e19e96777a0b63a6af80159372180dabfdabfd9 100644
--- a/components/user_prefs/tracked/pref_hash_filter.h
+++ b/components/user_prefs/tracked/pref_hash_filter.h
@@ -21,6 +21,7 @@
 #include "components/user_prefs/tracked/hash_store_contents.h"
 #include "components/user_prefs/tracked/interceptable_pref_filter.h"
 #include "components/user_prefs/tracked/tracked_preference.h"
+#include "services/preferences/public/interfaces/preferences_configuration.mojom-shared.h"
 
 class PrefHashStore;
 class PrefService;
@@ -45,22 +46,11 @@ class PrefRegistrySyncable;
 // are changed.
 class PrefHashFilter : public InterceptablePrefFilter {
  public:
-  enum class EnforcementLevel { NO_ENFORCEMENT, ENFORCE_ON_LOAD };
-
-  enum class PrefTrackingStrategy {
-    // Atomic preferences are tracked as a whole.
-    ATOMIC,
-    // Split preferences are dictionaries for which each top-level entry is
-    // tracked independently. Note: preferences using this strategy must be kept
-    // in sync with TrackedSplitPreferences in histograms.xml.
-    SPLIT,
-  };
-
-  enum class ValueType {
-    IMPERSONAL,
-    // The preference value may contain personal information.
-    PERSONAL,
-  };
+  using EnforcementLevel =
+      prefs::mojom::TrackedPreferenceMetadata_EnforcementLevel;
+  using PrefTrackingStrategy =
+      prefs::mojom::TrackedPreferenceMetadata_PrefTrackingStrategy;
+  using ValueType = prefs::mojom::TrackedPreferenceMetadata_ValueType;
 
   struct TrackedPreferenceMetadata {
     size_t reporting_id;