[sync] Add autofill sync metadata to the web db

components/autofill/core/browser/webdata/autofill_table.h

Index: components/autofill/core/browser/webdata/autofill_table.h
diff --git a/components/autofill/core/browser/webdata/autofill_table.h b/components/autofill/core/browser/webdata/autofill_table.h
index a8eceb0ae1b99c469fd9ba4cc3c234cc5d20b094..0cd473bc0b68136339df3550801a1d3aef4c7e3c 100644
--- a/components/autofill/core/browser/webdata/autofill_table.h
+++ b/components/autofill/core/browser/webdata/autofill_table.h
@@ -13,6 +13,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
+#include "components/sync/base/model_type.h"
 #include "components/webdata/common/web_database_table.h"
 
 class WebDatabase;
@@ -21,6 +22,11 @@ namespace base {
 class Time;
 }
 
+namespace sync_pb {
+class EntityMetadata;
+class ModelTypeState;
+}
+
 namespace autofill {
 
 class AutofillChange;
@@ -228,6 +234,18 @@ struct FormFieldData;
 //                      a form.
 //   use_date           The date this address was last used to fill a form,
 //                      in internal t.
+// autofill_sync_metadata
+//                      Sync-specific metadata for autofill records.
+//
+//   storage_key        A string that uniquely identifies the metadata record
+//                      as well as the corresponding autofill record.
+//   value              The serialized EntityMetadata record.
+//
+// autofill_model_type_state
+//                      Single row table that contains the sync ModelTypeState
+//                      for the autofill model type.
+//
+//   value              The serialized ModelTypeState record.
 
 class AutofillTable : public WebDatabaseTable {
  public:
@@ -403,6 +421,39 @@ class AutofillTable : public WebDatabaseTable {
   // Clear all profiles.
   bool ClearAutofillProfiles();
 
+  // Look up the metadata record of |model_type| keyed by |storage_key| and fill
+  // |metadata| with it.
+  bool GetSyncMetadata(syncer::ModelType model_type,
+                       const std::string& storage_key,
+                       sync_pb::EntityMetadata* metadata);
+
+  // Read all the stored metadata of |model_type| and fill |metadata_records|
+  // with it.
+  bool GetAllSyncMetadata(
+      syncer::ModelType model_type,
+      std::vector<sync_pb::EntityMetadata>* metadata_records);
+
+  // Update the metadata row for |model_type|, keyed by |storage_key|, to
+  // contain the contents of |metadata|.
+  bool UpdateSyncMetadata(syncer::ModelType model_type,
+                          const std::string& storage_key,
+                          const sync_pb::EntityMetadata& metadata);
+
+  // Remove the metadata row of type |model_type| keyed by |storage|key|.
+  bool ClearSyncMetadata(syncer::ModelType model_type,
+                         const std::string& storage_key);
+
+  // Retrieve the stored sync state for the |model_type|.
+  bool GetModelTypeState(syncer::ModelType model_type,
+                         sync_pb::ModelTypeState* state);
+
+  // Update the stored sync state for the |model_type|.
+  bool UpdateModelTypeState(syncer::ModelType model_type,
+                            sync_pb::ModelTypeState& model_type_state);
+
+  // Clear the stored sync state for |model_type|.
+  bool ClearModelTypeState(syncer::ModelType model_type);
+
   // Table migration functions. NB: These do not and should not rely on other
   // functions in this class. The implementation of a function such as
   // GetCreditCard may change over time, but MigrateToVersionXX should never
@@ -419,6 +470,7 @@ class AutofillTable : public WebDatabaseTable {
   bool MigrateToVersion65AddServerMetadataTables();
   bool MigrateToVersion66AddCardBillingAddress();
   bool MigrateToVersion67AddMaskedCardBillingAddress();
+  bool MigrateToVersion70AddSyncMetadata();
 
   // Max data length saved in the table, AKA the maximum length allowed for
   // form data.
@@ -496,6 +548,8 @@ class AutofillTable : public WebDatabaseTable {
   bool InitServerCardMetadataTable();
   bool InitServerAddressesTable();
   bool InitServerAddressMetadataTable();
+  bool InitAutofillSyncMetadataTable();
+  bool InitModelTypeStateTable();
 
   DISALLOW_COPY_AND_ASSIGN(AutofillTable);
 };