NTPSnippets: Set MaxRetriesOn5xx only for interactive requests.

components/ntp_snippets/remote/ntp_snippets_fetcher.cc

Index: components/ntp_snippets/remote/ntp_snippets_fetcher.cc
diff --git a/components/ntp_snippets/remote/ntp_snippets_fetcher.cc b/components/ntp_snippets/remote/ntp_snippets_fetcher.cc
index 76ec5f1e74585dcc93d1db4bacd49745612ecec3..360d4764d079f064895b53f462cb47b7dbd0c706 100644
--- a/components/ntp_snippets/remote/ntp_snippets_fetcher.cc
+++ b/components/ntp_snippets/remote/ntp_snippets_fetcher.cc
@@ -4,6 +4,7 @@
 
 #include "components/ntp_snippets/remote/ntp_snippets_fetcher.h"
 
+#include <algorithm>
 #include <cstdlib>
 #include <utility>
 
@@ -61,6 +62,9 @@ const char kAuthorizationRequestHeaderFormat[] = "Bearer %s";
 // Variation parameter for personalizing fetching of snippets.
 const char kPersonalizationName[] = "fetching_personalization";
 
+// Variation parameter for disabling the retry.
+const char kBackground5xxRetriesName[] = "background_5xx_retries_count";
+
 // Variation parameter for chrome-content-suggestions backend.
 const char kContentSuggestionsBackend[] = "content_suggestions_backend";
 
@@ -132,6 +136,15 @@ bool IsBooleanParameterEnabled(const std::string& param_name,
   return default_value;
 }
 
+int Get5xxRetryCount(bool interactive_request) {
+  if (interactive_request) {
+    return 2;
+  }
+  return std::max(0, variations::GetVariationParamByFeatureAsInt(
+                         ntp_snippets::kArticleSuggestionsFeature,
+                         kBackground5xxRetriesName, 0));
+}
+
 bool UsesChromeContentSuggestionsAPI(const GURL& endpoint) {
   if (endpoint == kChromeReaderServer) {
     return false;
@@ -812,8 +825,8 @@ NTPSnippetsFetcher::RequestBuilder::BuildURLFetcher(
 
   // Fetchers are sometimes cancelled because a network change was detected.
   url_fetcher->SetAutomaticallyRetryOnNetworkChanges(3);
-  // Try to make fetching the files bit more robust even with poor connection.
-  url_fetcher->SetMaxRetriesOn5xx(3);
+  url_fetcher->SetMaxRetriesOn5xx(
+      Get5xxRetryCount(params_.interactive_request));
   return url_fetcher;
 }