Display status message for "Add snippets" on chrome://snippets-internals

components/ntp_snippets/ntp_snippets_fetcher.h

Index: components/ntp_snippets/ntp_snippets_fetcher.h
diff --git a/components/ntp_snippets/ntp_snippets_fetcher.h b/components/ntp_snippets/ntp_snippets_fetcher.h
index ae7fd6c97b85919d9d713199e98ebee26a11ad5e..1c0b7d4e7a109a0d741bd8ed4c7ea2a40ebcc9aa 100644
--- a/components/ntp_snippets/ntp_snippets_fetcher.h
+++ b/components/ntp_snippets/ntp_snippets_fetcher.h
@@ -21,9 +21,13 @@ namespace ntp_snippets {
 // Fetches snippet data for the NTP from the server
 class NTPSnippetsFetcher : public net::URLFetcherDelegate {
  public:
-  using SnippetsAvailableCallback = base::Callback<void(const std::string&)>;
+  // If problems occur (explained in |status_message|), |snippets_json| is
+  // empty; otherwise, |status_message| is empty.
+  using SnippetsAvailableCallback =
+      base::Callback<void(const std::string& snippets_json,
+                          const std::string& status_message)>;
   using SnippetsAvailableCallbackList =
-      base::CallbackList<void(const std::string&)>;
+      base::CallbackList<void(const std::string&, const std::string&)>;
 
   NTPSnippetsFetcher(
       scoped_refptr<base::SequencedTaskRunner> file_task_runner,