Add a feature flag for InterestFeedContentSuggestions

This flag isn't used currently, but it will be soon.

BUG=803319

Change-Id: Id6755d662092d9078a516acd000ffe905dbe7c73
Reviewed-on: https://chromium-review.googlesource.com/952569
Commit-Queue: Theresa <[email protected]>
Reviewed-by: Filip Gorski <[email protected]>
Cr-Commit-Position: refs/heads/master@{#541501}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 8fd54b73..8cb64cf5 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2055,6 +2055,12 @@
     "Automatically grant the notifications permission to the Default Search "
     "Engine";
 
+const char kInterestFeedContentSuggestionsDescription[] =
+    "Use the interest feed to render content suggestions. Currently content "
+    "suggestions are shown on the New Tab Page.";
+const char kInterestFeedContentSuggestionsName[] =
+    "Interest Feed Content Suggestions";
+
 const char kKeepPrefetchedContentSuggestionsName[] =
     "Keep prefetched content suggestions";
 const char kKeepPrefetchedContentSuggestionsDescription[] =