Added SetActivityAsync to Base and Sharded Socket clients

src/Discord.Net.WebSocket/BaseSocketClient.cs

@@ -45,6 +45,7 @@ namespace Discord.WebSocket
         public abstract Task StopAsync();
         public abstract Task SetStatusAsync(UserStatus status);
         public abstract Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming);
+        public abstract Task SetActivityAsync(IActivity activity);
         public abstract Task DownloadUsersAsync(IEnumerable<IGuild> guilds);  
 
         /// <inheritdoc />

src/Discord.Net.WebSocket/DiscordShardedClient.cs

@@ -239,9 +239,18 @@ namespace Discord.WebSocket
                 await _shards[i].SetStatusAsync(status).ConfigureAwait(false);
         }
         public override async Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming)
+        {
+            IActivity activity = null;
+            if (streamUrl != null)
+                activity = new StreamingGame(name, streamUrl, streamType);
+            else if (name != null)
+                activity = new Game(name);
+            await SetActivityAsync(activity).ConfigureAwait(false);
+        }
+        public override async Task SetActivityAsync(IActivity activity)
         {
             for (int i = 0; i < _shards.Length; i++)
-                await _shards[i].SetGameAsync(name, streamUrl, streamType).ConfigureAwait(false);
+                await _shards[i].SetActivityAsync(activity).ConfigureAwait(false);
         }
 
         private void RegisterEvents(DiscordSocketClient client, bool isPrimary)

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -328,7 +328,7 @@ namespace Discord.WebSocket
         }
         public override async Task SetGameAsync(string name, string streamUrl = null, StreamType streamType = StreamType.NotStreaming)
         {
-            if (name != null && streamUrl != null)
+            if (streamUrl != null)
                 Activity = new StreamingGame(name, streamUrl, streamType);
             else if (name != null)
                 Activity = new Game(name);
@@ -336,7 +336,7 @@ namespace Discord.WebSocket
                 Activity = null;
             await SendStatusAsync().ConfigureAwait(false);
         }
-        public async Task SetActivityAsync(IActivity activity)
+        public override async Task SetActivityAsync(IActivity activity)
         {
             Activity = activity;
             await SendStatusAsync().ConfigureAwait(false);