Wait for 50 ms after the last errors batch before applying error markers.

It is probably long enough to process more than a single batch of errors,
if there is a continuous stream of them.

OTOH, it is short enough to make semantic highlighting and errors being
updated almost at the same time.

R=brianwilkerson@google.com, danrubel@google.com
BUG=

Review URL: https://codereview.chromium.org//739433007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42009 260f80e4-7a28-3924-810f-c04153c831b5
Increase the isolate size to 4GB when the VM is started for the analysis server

R=scheglov@google.com

Review URL: https://codereview.chromium.org//762933002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42010 260f80e4-7a28-3924-810f-c04153c831b5