Implement logging of the Credential Manager API calls to chrome://password-manager-internals.

components/password_manager/core/common/credential_manager_types.cc

Index: components/password_manager/core/common/credential_manager_types.cc
diff --git a/components/password_manager/core/common/credential_manager_types.cc b/components/password_manager/core/common/credential_manager_types.cc
index 484b2be7858403a418b1e2caa1ab90fb3958589f..068d3ac7bfba644369a31d54188036a39f192d84 100644
--- a/components/password_manager/core/common/credential_manager_types.cc
+++ b/components/password_manager/core/common/credential_manager_types.cc
@@ -5,20 +5,26 @@
 #include "components/password_manager/core/common/credential_manager_types.h"
 
 #include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
 #include "components/autofill/core/common/password_form.h"
 
 namespace password_manager {
 
-std::ostream& operator<<(std::ostream& os, CredentialType value) {
+std::string CredentialTypeToString(CredentialType value) {
   switch (value) {
     case CredentialType::CREDENTIAL_TYPE_EMPTY:
-      return os << "CredentialType::CREDENTIAL_TYPE_EMPTY";
+      return "CredentialType::CREDENTIAL_TYPE_EMPTY";
     case CredentialType::CREDENTIAL_TYPE_PASSWORD:
-      return os << "CredentialType::CREDENTIAL_TYPE_PASSWORD";
+      return "CredentialType::CREDENTIAL_TYPE_PASSWORD";
     case CredentialType::CREDENTIAL_TYPE_FEDERATED:
-      return os << "CredentialType::CREDENTIAL_TYPE_FEDERATED";
+      return "CredentialType::CREDENTIAL_TYPE_FEDERATED";
   }
-  return os << "Unknown CredentialType value: " << static_cast<int32_t>(value);
+  return "Unknown CredentialType value: " +
+         base::IntToString(static_cast<int>(value));
+}
+
+std::ostream& operator<<(std::ostream& os, CredentialType value) {
+  return os << CredentialTypeToString(value);
 }
 
 CredentialInfo::CredentialInfo() : type(CredentialType::CREDENTIAL_TYPE_EMPTY) {