Add kEmojiSuggestAddition to chrome:://flags

Adding chrome flags so it's easier for UX and QA people to test the
feature.

Bug: 1065308
Change-Id: If3a7ef76fe157019efedcf87fbfa5d87b2d3fade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124128
Reviewed-by: Darren Shen <[email protected]>
Commit-Queue: My Nguyen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#754370}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 22af89b..f5202b3f 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2016,6 +2016,9 @@
 extern const char kImeAssistPersonalInfoName[];
 extern const char kImeAssistPersonalInfoDescription[];
 
+extern const char kImeEmojiSuggestAdditionName[];
+extern const char kImeEmojiSuggestAdditionDescription[];
+
 extern const char kImeInputLogicFstName[];
 extern const char kImeInputLogicFstDescription[];