Adds a new flag for accessibility image label features.

This does not yet do anything.
See more background in the bug.

Bug: 905419
Change-Id: I67cea842e5e83804ebe7618855e0712d74cbf76a
Reviewed-on: https://chromium-review.googlesource.com/c/1387831
Reviewed-by: Dominic Mazzoni <[email protected]>
Reviewed-by: Elly Fong-Jones <[email protected]>
Commit-Queue: Katie Dektar <[email protected]>
Cr-Commit-Position: refs/heads/master@{#619430}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 2040a504..e658eb0 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -166,6 +166,9 @@
 extern const char kExperimentalAccessibilityAutoclickName[];
 extern const char kExperimentalAccessibilityAutoclickDescription[];
 
+extern const char kExperimentalAccessibilityLabelsName[];
+extern const char kExperimentalAccessibilityLabelsDescription[];
+
 extern const char kExperimentalAccessibilitySwitchAccessName[];
 extern const char kExperimentalAccessibilitySwitchAccessDescription[];