Reduce and limit video poster memory usage

chrome/browser/media/android/remote/remote_media_player_manager.h

Index: chrome/browser/media/android/remote/remote_media_player_manager.h
diff --git a/chrome/browser/media/android/remote/remote_media_player_manager.h b/chrome/browser/media/android/remote/remote_media_player_manager.h
index e0cef391542cbf4117170561d59772f9563822c4..fea7caa9d9e44af35c80bc5a2790bf61ec734817 100644
--- a/chrome/browser/media/android/remote/remote_media_player_manager.h
+++ b/chrome/browser/media/android/remote/remote_media_player_manager.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_MEDIA_ANDROID_REMOTE_REMOTE_MEDIA_PLAYER_MANAGER_H_
 
 #include <set>
+#include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
@@ -105,12 +106,15 @@ class RemoteMediaPlayerManager : public content::BrowserMediaPlayerManager {
 
   void SwapCurrentPlayer(int player_id);
 
+  void FetchPosterBitmap(int player_id);
+
   // Contains the alternative players that are not currently in use, i.e. the
   // remote players for videos that are playing locally, and the local players
   // for videos that are playing remotely.
   ScopedVector<media::MediaPlayerAndroid> alternative_players_;
 
   std::set<int> players_playing_remotely_;
+  std::unordered_map<int, GURL> poster_urls_;
 
   base::WeakPtrFactory<RemoteMediaPlayerManager> weak_ptr_factory_;