Inject CanAddURLToHistory into TopSitesImpl

components/history/core/test/database_test_utils.h

Index: components/history/core/test/database_test_utils.h
diff --git a/components/history/core/test/database_test_utils.h b/components/history/core/test/database_test_utils.h
index 9e82ebb1f00014b3332261fd9f9a1b58d174c725..8b91767da5d60c437f19d0216d2a4f02e32d3af8 100644
--- a/components/history/core/test/database_test_utils.h
+++ b/components/history/core/test/database_test_utils.h
@@ -13,6 +13,10 @@ class FilePath;
 
 namespace history {
 
+// Sets |dir| to the path of the history data directory. Returns true on success
+// or false, in which case |dir| is undefined.
+WARN_UNUSED_RESULT bool GetTestDataHistoryDir(base::FilePath* dir);
+
 // Create the test database at |db_path| from the golden file at |ascii_path| in
 // the "history" subdir of the components test data dir.
 WARN_UNUSED_RESULT bool CreateDatabaseFromSQL(const base::FilePath& db_path,