Implement the statistics table for the passwords.

components/password_manager/core/browser/mock_password_store.h

Index: components/password_manager/core/browser/mock_password_store.h
diff --git a/components/password_manager/core/browser/mock_password_store.h b/components/password_manager/core/browser/mock_password_store.h
index 70f54e915850d6db833ece5a7e1e41395f3d6b95..bb592c6e8df4da46b08afdf109b258385ddd80c9 100644
--- a/components/password_manager/core/browser/mock_password_store.h
+++ b/components/password_manager/core/browser/mock_password_store.h
@@ -47,6 +47,11 @@ class MockPasswordStore : public PasswordStore {
   MOCK_METHOD1(FillBlacklistLogins,
                bool(ScopedVector<autofill::PasswordForm>*));
   MOCK_METHOD1(NotifyLoginsChanged, void(const PasswordStoreChangeList&));
+  void AddSiteStatsImpl(const InteractionsStats& stats) override {}
+  void RemoveSiteStatsImpl(const GURL& origin_domain) override {}
+  InteractionsStats* GetSiteStatsImpl(const GURL& origin_domain) override {
+    return nullptr;
+  }
 
   PasswordStoreSync* GetSyncInterface() { return this; }