Mark virtual/gpu/fast/canvas/webgl/webgl-large-texture.html as slow

TBR=kbr@chromium.org
BUG=358313

Review URL: https://codereview.chromium.org/218623010

git-svn-id: svn://svn.chromium.org/blink/trunk@170481 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/SlowTests

@@ -134,4 +134,6 @@ crbug.com/248969 [ Debug ] printing/page-count-with-one-word.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 ]
+crbug.com/346259 http/tests/websocket/no-crash-on-cookie-flood.html [ Slow ]
\ No newline at end of file
+
+crbug.com/358313 virtual/gpu/fast/canvas/webgl/webgl-large-texture.html [ Slow ]