Create experimental handwriting gesture flag for virtual keyboard.

Disabled by default as the UI is a WIP, and feasibility is being
evaluated.

Bug: 920519
Change-Id: Idc7e0a6e92aa0234de54b72f8e024e987da9f5dd
Reviewed-on: https://chromium-review.googlesource.com/c/1404759
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Scott Violet <[email protected]>
Commit-Queue: Gabrielle Palado <[email protected]>
Cr-Commit-Position: refs/heads/master@{#623143}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index f33ceb7c..a2cc2b9 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -658,6 +658,9 @@
 extern const char kGoogleProfileInfoName[];
 extern const char kGoogleProfileInfoDescription[];
 
+extern const char kHandwritingGestureName[];
+extern const char kHandwritingGestureDescription[];
+
 extern const char kHarfbuzzRendertextName[];
 extern const char kHarfbuzzRendertextDescription[];