Adds a chrome://flags flag for Live Captions.

This will help us test the feature in Canary!

Bug: 1055150
Change-Id: I02a5deb241dfd26ddf4dc58a84f04a79b1c3d227
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2158008
Reviewed-by: Abigail Klein <[email protected]>
Reviewed-by: Scott Violet <[email protected]>
Commit-Queue: Katie Dektar <[email protected]>
Cr-Commit-Position: refs/heads/master@{#761112}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 2a331b8..155be45 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2747,6 +2747,12 @@
 
 #else  // !defined(OS_ANDROID)
 
+const char kEnableAccessibilityLiveCaptionsName[] = "Live Captions";
+const char kEnableAccessibilityLiveCaptionsDescription[] =
+    "Enables the live captions feature which generates captions for "
+    "media playing in Chrome. Turn the feature on in "
+    "chrome://settings/accessibility.";
+
 const char kCastMediaRouteProviderName[] = "Cast Media Route Provider";
 const char kCastMediaRouteProviderDescription[] =
     "Enables the native Cast Media Route Provider implementation to be used "