[Test] Intermittent timeouts with javax/swing tests

. When tested with JDK10-internal on Win10 with Nvidia card, the following swing tests failed with timeout-
      . javax/swing/JColorChooser/Test6827032.java
      . javax/swing/JToolTip/6219960/bug6219960.java
      . javax/swing/JTree/4633594/JTreeFocusTest.java
. Note: The timeouts were not consistent. Excerpts from the test are as follows-

#-----testresult-----
description=file\:/<path>/client/open/test/jdk/javax/swing/JColorChooser/Test6827032.java
elapsed=120756 0\:02\:00.756
end=Mon Jan 29 13\:03\:45 IST 2018
environment=regtest
execStatus=Error. Program `<path>\\windows-x86_64-normal-server-release\\images\\jdk\\bin\\java' timed out (timeout set to 120000ms, elapsed time including timeout handling was 120106ms).
javatestOS=Windows 10 10.0 (x86)
javatestVersion=5.0
jtregVersion=jtreg 4.2 dev b12

#-----testresult-----
description=file\:<path>/client/open/test/jdk/javax/swing/JToolTip/6219960/bug6219960.java
elapsed=120911 0\:02\:00.911
end=Mon Jan 29 13\:28\:30 IST 2018
environment=regtest
execStatus=Error. Program `d\:<path>\\windows-x86_64-normal-server-release\\images\\jdk\\bin\\java' timed out (timeout set to 120000ms, elapsed time including timeout handling was 120151ms).
javatestOS=Windows 10 10.0 (x86)
javatestVersion=5.0
jtregVersion=jtreg 4.2 dev b12

#-----testresult-----
description=file\:/<path>/client/open/test/jdk/javax/swing/JTree/4633594/JTreeFocusTest.java
elapsed=120853 0\:02\:00.853
end=Mon Jan 29 13\:30\:34 IST 2018
environment=regtest
execStatus=Error. Program `d\:<path>\\windows-x86_64-normal-server-release\\images\\jdk\\bin\\java' timed out (timeout set to 120000ms, elapsed time including timeout handling was 120063ms).
javatestOS=Windows 10 10.0 (x86)
javatestVersion=5.0
jtregVersion=jtreg 4.2 dev b12