Revert of Revert of Add a layout test for per-renderer WebSocket throttling (patchset #1 id:1 of https://codereview.chromium.org/999243005/)

Reason for revert:
The chromium-side CL was found innocent and relanded.

Original issue's description:
> Revert of Add a layout test for per-renderer WebSocket throttling (patchset #8 id:140001 of https://codereview.chromium.org/970203004/)
> 
> Reason for revert:
> It looks like related patches were reverted to address https://crbug.com/467471, but this test wasn't dropped as well.
> 
> Original issue's description:
> > Add a layout test for per-renderer WebSocket throttling
> > 
> > Depending on a Chromium-side CL:
> > https://codereview.chromium.org/972963002/
> > 
> > BUG=459377
> > 
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191760
> 
> [email protected],[email protected]
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=459377
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191911

[email protected],[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=459377

Review URL: https://codereview.chromium.org/1014563002

git-svn-id: svn://svn.chromium.org/blink/trunk@191917 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/third_party/WebKit/LayoutTests/SlowTests b/third_party/WebKit/LayoutTests/SlowTests
index 0b36e3a..da2030e 100644
--- a/third_party/WebKit/LayoutTests/SlowTests
+++ b/third_party/WebKit/LayoutTests/SlowTests
@@ -176,6 +176,9 @@
 crbug.com/245154 editing/selection/move-by-character-brute-force.html [ Slow ]
 crbug.com/246749 inspector/extensions/extensions-panel.html [ Slow ]
 
+# This test takes 5+ seconds as intended because it tests connection throttling.
+crbug.com/459377 http/tests/websocket/multiple-connections-throttled.html [ Slow ]
+
 crbug.com/336481 inspector/jump-to-previous-editing-location.html [ Slow ]
 
 crbug.com/346259 http/tests/websocket/no-crash-on-cookie-flood.html [ Slow ]