[Media] Added feature flag for new remote playback pipeline

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index ce8ff8b7d7211c45bddd704d5a8674459092874c..19d1fa57d9b3c1398d602e6853ceb2b892d5f6e8 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2797,6 +2797,14 @@ extern const char kBackgroundVideoTrackOptimizationName[];
 // Description of the flag for enabling optimizing background video playback.
 extern const char kBackgroundVideoTrackOptimizationDescription[];
 
+//  New remote playback pipeline experiment strings.
+
+// Name of the flag for enabling the new remote playback pipeline.
+extern const char kNewRemotePlaybackPipelineName[];
+
+// Description of the flag for enabling the new remote playback pipeline.
+extern const char kNewRemotePlaybackPipelineDescription[];
+
 //  Video fullscreen with orientation lock experiment strings.
 
 // Name of the flag for enabling orientation lock for fullscreen video playback.