Add EnableInputNoiseCancellationUi flag

This flag gates whether the input noise cancellation UI toggle will display.

Bug: 1205197
Change-Id: I19cee20e235969bb86294391e1268c9ebfc4f7c3
Test: local
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2869026
Commit-Queue: Anton Swifton <[email protected]>
Reviewed-by: Jimmy Gong <[email protected]>
Cr-Commit-Position: refs/heads/master@{#878720}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 9d99512..60c36f6a 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -4278,6 +4278,12 @@
     "Enable additional heuristic palm rejection logic when interacting with "
     "stylus usage. Not intended for all devices.";
 
+const char kEnableInputNoiseCancellationUiName[] =
+    "Enable Input Noise Cancellation UI.";
+const char kEnableInputNoiseCancellationUiDescription[] =
+    "Enable toggling input noise cancellation through the Quick Settings. By "
+    "default, this flag is disabled.";
+
 const char kEnableLauncherSearchNormalizationName[] =
     "Enable normalization of launcher search results";
 const char kEnableLauncherSearchNormalizationDescription[] =