video/lacros: add AV1 flag to lacros

This CL adds the kVaapiAV1Decoder flag to the chrome://flags
UI in lacros-chrome so now we can enable hardware AV1 decoding

BUG=b:177462291
TEST=manual test on volteer

Change-Id: I9acec23ec8963f071d4f2fa11c4fd5adc5b4d2f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2762341
Reviewed-by: Andres Calderon Jaramillo <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Pilar Molina Lopez <[email protected]>
Cr-Commit-Position: refs/heads/master@{#863113}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 2521859e..2ad4087 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2841,10 +2841,6 @@
 extern const char kUseFakeDeviceForMediaStreamName[];
 extern const char kUseFakeDeviceForMediaStreamDescription[];
 
-// TODO(b/177462291): make flag available on LaCrOS.
-extern const char kVaapiAV1DecoderName[];
-extern const char kVaapiAV1DecoderDescription[];
-
 extern const char kVaapiJpegImageDecodeAccelerationName[];
 extern const char kVaapiJpegImageDecodeAccelerationDescription[];
 
@@ -2879,6 +2875,9 @@
 #if defined(OS_CHROMEOS)
 extern const char kDeprecateLowUsageCodecsName[];
 extern const char kDeprecateLowUsageCodecsDescription[];
+
+extern const char kVaapiAV1DecoderName[];
+extern const char kVaapiAV1DecoderDescription[];
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_CHROMEOS) && BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)