Added flag to control VS Feedback Panel

Implementation of updated visual signals for the File manager
requires gating the new features behind a flag.

This CL adds a flag to control the new Feedback Panel.

Bug: 947388
Change-Id: Ia0d4ae9e5f1ebbc8bd3a88b4fa9c5e87d340b3c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545436
Commit-Queue: Alex Danilo <[email protected]>
Reviewed-by: Noel Gordon <[email protected]>
Reviewed-by: Elly Fong-Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#646724}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index cd22b23..666bdee 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1937,6 +1937,9 @@
 extern const char
     kExperimentalAccessibilityChromeVoxRichTextIndicationDescription[];
 
+extern const char kFileManagerFeedbackPanelDescription[];
+extern const char kFileManagerFeedbackPanelName[];
+
 extern const char kFileManagerTouchModeName[];
 extern const char kFileManagerTouchModeDescription[];