[Desktop] Add diagnostics about loading the refresh tokens.

components/signin/core/browser/webdata/token_web_data.h

Index: components/signin/core/browser/webdata/token_web_data.h
diff --git a/components/signin/core/browser/webdata/token_web_data.h b/components/signin/core/browser/webdata/token_web_data.h
index ceec9cdcc86073a8447fe06fbf1b6370ff0c24a9..f47f371c2529c9ba545eb9183be56c893b60fa40 100644
--- a/components/signin/core/browser/webdata/token_web_data.h
+++ b/components/signin/core/browser/webdata/token_web_data.h
@@ -18,6 +18,7 @@
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "components/signin/core/browser/webdata/token_service_table.h"
 #include "components/webdata/common/web_data_results.h"
 #include "components/webdata/common/web_data_service_base.h"
 #include "components/webdata/common/web_data_service_consumer.h"
@@ -31,6 +32,16 @@ class TokenWebDataBackend;
 class WebDatabaseService;
 class WebDataServiceConsumer;
 
+// The result of a get tokens operation.
+struct TokenResult {
+  TokenResult();
+  TokenResult(const TokenResult& other);
+  ~TokenResult();
+
+  TokenServiceTable::Result db_result;
+  std::map<std::string, std::string> tokens;
+};
+
 // TokenWebData is a data repository for storage of authentication tokens.
 
 class TokenWebData : public WebDataServiceBase {