Add new feature flag for Assistant key remapping.

This change adds a new flag in chrome://flags to enable Assistant key
remapping in the keyboard settings.

Bug: None.
Test: local compile and manually test.
Change-Id: I9708e705da6e9e012089a4559965cb2f431bd87f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573002
Commit-Queue: Meilin Wang <[email protected]>
Reviewed-by: Tao Wu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#652468}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index d851cb85..b7e00cc8 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3076,6 +3076,11 @@
 const char kEnableAssistantAppSupportDescription[] =
     "Enable the Assistant App Support feature";
 
+const char kEnableAssistantKeyRemappingName[] =
+    "Enable Assistant Key Remapping";
+const char kEnableAssistantKeyRemappingDescription[] =
+    "Allow Assistant key remapping in the keyboard settings.";
+
 const char kEnableAssistantLauncherIntegrationName[] =
     "Assistant & Launcher integration";
 const char kEnableAssistantLauncherIntegrationDescription[] =