RFR: 8244579: Windows "User Objects" leakage with WebView

[Kevin Rushforth]

On Wed, 20 May 2020 14:30:11 GMT, Arun Joseph <ajoseph at openjdk.org> wrote:

> Cause: The Window Class `RunLoopMessageWindow` is never registered (this happens because
> registerRunLoopMessageWindowClass() is moved to MainThreadWin.cpp while openjfx uses MainThreadJava.cpp) and this
> causes every SetTimer() call in
> [RunLoopWin.cpp](https://github.com/openjdk/jfx/blob/master/modules/javafx.web/src/main/native/Source/WTF/wtf/win/RunLoopWin.cpp)
> to create a new user object instead of reusing the same object over again.  Fix: Call
> registerRunLoopMessageWindowClass() from MainThreadJava.cpp  Test: To verify open any webpage using WebView on WIndows,
> with and without the fix and compare the number of user objects created using Windows Task Manager.

Marked as reviewed by kcr (Lead).

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PR: https://git.openjdk.java.net/jfx/pull/229