WebKit side of merge from r41149 to r41181.

JavaScriptCore/wtf/ThreadingQt.cpp

Index: JavaScriptCore/wtf/ThreadingQt.cpp
===================================================================
--- JavaScriptCore/wtf/ThreadingQt.cpp	(revision 10232)
+++ JavaScriptCore/wtf/ThreadingQt.cpp	(working copy)
@@ -242,11 +242,13 @@
     if (absoluteTime < currentTime)
         return false;
 
+    // Time is too far in the future (and would overflow unsigned long) - wait forever.
+    if (absoluteTime - currentTime > static_cast<double>(INT_MAX) / 1000.0) {
+        wait(mutex);
+        return true;
+    }
+
     double intervalMilliseconds = (absoluteTime - currentTime) * 1000.0;
-    // Qt defines wait for up to ULONG_MAX milliseconds.
-    if (intervalMilliseconds >= ULONG_MAX)
-        intervalMilliseconds = ULONG_MAX;
-
     return m_condition->wait(mutex.impl(), static_cast<unsigned long>(intervalMilliseconds));
 }