Made changes to use Util::waitForIdle instead of Toolkit::firePulse in system tests. The test will wait for default value of 10 pulses to complete in the scene before executing the subsequent statements.
------------- Commit messages: - Use Util::waitForIdle instead of Toolkit::firePulse Changes: https://git.openjdk.org/jfx/pull/1230/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1230&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8308608 Stats: 7 lines in 2 files changed: 2 ins; 5 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1230.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1230/head:pull/1230 PR: https://git.openjdk.org/jfx/pull/1230
