Constrain screensharing in getDisplayMedia

app/src/RoomClient.js

@@ -2484,9 +2484,9 @@ export default class RoomClient
 			logger.debug('enableScreenSharing() | calling getUserMedia()');
 
 			const stream = await this._screenSharing.start({
-				width     : 1280,
+				width     : 1920,
-				height    : 720,
+				height    : 1080,
-				frameRate : 3
+				frameRate : 5
 			});
 
 			track = stream.getVideoTracks()[0];

app/src/ScreenShare.js

@@ -101,12 +101,25 @@ class DisplayMediaScreenShare
 		return true;
 	}
 
-	_toConstraints()
+	_toConstraints(options)
 	{
 		const constraints = {
-			video : true
+			video : {}
 		};
 
+		if (isFinite(options.width))
+		{
+			constraints.video.width = options.width;
+		}
+		if (isFinite(options.height))
+		{
+			constraints.video.height = options.height;
+		}
+		if (isFinite(options.frameRate))
+		{
+			constraints.video.frameRate = options.frameRate;
+		}
+
 		return constraints;
 	}
 }