sync: Add GetAllSyncData to sync/api

chrome/browser/extensions/api/storage/settings_sync_unittest.cc

Index: chrome/browser/extensions/api/storage/settings_sync_unittest.cc
diff --git a/chrome/browser/extensions/api/storage/settings_sync_unittest.cc b/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
index 903ede8d42da6b9fb36328102acc88bcbacee691..6c1f6fc8db3cb487b0330bbe1129c08db4cda3e7 100644
--- a/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
+++ b/chrome/browser/extensions/api/storage/settings_sync_unittest.cc
@@ -108,6 +108,10 @@ class MockSyncChangeProcessor : public syncer::SyncChangeProcessor {
     return syncer::SyncError();
   }
 
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const {
+    return syncer::SyncDataList();
+  }
+
   // Mock methods.
 
   const SettingSyncDataList& changes() { return changes_; }
@@ -166,6 +170,10 @@ class SyncChangeProcessorDelegate : public syncer::SyncChangeProcessor {
     return recipient_->ProcessSyncChanges(from_here, change_list);
   }
 
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const {
+    return recipient_->GetAllSyncData(type);
+  }
+
  private:
   // The recipient of all sync changes.
   syncer::SyncChangeProcessor* recipient_;