add Heuristic change into flags list in chrome://settings.

This adds the change to enable/disable heursitic stylus/palm rejection
as a visible flag in chrome://settings. Allows folks to turn it on/off
as needed, and mentions (in the visible description) it is not
intended for all devices.

Bug: 982118
Change-Id: Id9c18eb5b5c7bec359a0a650acf4a14fb2303120
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728449
Commit-Queue: Rob Schonberger <[email protected]>
Reviewed-by: Michael Spang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#682995}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 2f92912..e223ffa 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1915,6 +1915,9 @@
 extern const char kEnableGoogleAssistantStereoInputName[];
 extern const char kEnableGoogleAssistantStereoInputDescription[];
 
+extern const char kEnableHeuristicStylusPalmRejectionName[];
+extern const char kEnableHeuristicStylusPalmRejectionDescription[];
+
 extern const char kEnableHomeLauncherName[];
 extern const char kEnableHomeLauncherDescription[];