Revert of Revert of Support casting for embedded YT videos

content/common/media/media_player_messages_android.h

Index: content/common/media/media_player_messages_android.h
diff --git a/content/common/media/media_player_messages_android.h b/content/common/media/media_player_messages_android.h
index a5a8b7a0e07b5b39ff6983c0fc58635f271a1291..4548f0b849b05010f755cea891495490f86a2b8a 100644
--- a/content/common/media/media_player_messages_android.h
+++ b/content/common/media/media_player_messages_android.h
@@ -61,6 +61,17 @@
 IPC_STRUCT_TRAITS_END()
 
 IPC_ENUM_TRAITS(MediaPlayerHostMsg_Initialize_Type)
+
+// Parameters to describe a media player
+IPC_STRUCT_BEGIN(MediaPlayerHostMsg_Initialize_Params)
+  IPC_STRUCT_MEMBER(MediaPlayerHostMsg_Initialize_Type, type)
+  IPC_STRUCT_MEMBER(base::SharedMemoryHandle, metafile_data_handle)
+  IPC_STRUCT_MEMBER(int, player_id)
+  IPC_STRUCT_MEMBER(int, demuxer_client_id)
+  IPC_STRUCT_MEMBER(GURL, url)
+  IPC_STRUCT_MEMBER(GURL, first_party_for_cookies)
+  IPC_STRUCT_MEMBER(GURL, frame_url)
+IPC_STRUCT_END()
 
 // Chrome for Android seek message sequence is:
 // 1. Renderer->Browser MediaPlayerHostMsg_Seek
@@ -198,21 +209,10 @@
 IPC_MESSAGE_ROUTED1(MediaPlayerHostMsg_DestroyMediaPlayer,
                     int /* player_id */)
 
-// Initialize a media player object with the given type and player_id. The other
-// parameters are used depending on the type of player.
-//
-// url: the URL to load when initializing a URL player.
-//
-// first_party_for_cookies: the cookie store to use when loading a URL.
-//
-// demuxer_client_id: the demuxer associated with this player when initializing
-// a media source player.
-IPC_MESSAGE_ROUTED5(MediaPlayerHostMsg_Initialize,
-                    MediaPlayerHostMsg_Initialize_Type /* type */,
-                    int /* player_id */,
-                    GURL /* url */,
-                    GURL /* first_party_for_cookies */,
-                    int /* demuxer_client_id */)
+// Initialize a media player object.
+IPC_MESSAGE_ROUTED1(
+    MediaPlayerHostMsg_Initialize,
+    MediaPlayerHostMsg_Initialize_Params);
 
 // Pause the player.
 IPC_MESSAGE_ROUTED2(MediaPlayerHostMsg_Pause,