Oilpan: Fix worker thread termination finalization order issues.

Source/core/workers/WorkerThread.cpp

Index: Source/core/workers/WorkerThread.cpp
diff --git a/Source/core/workers/WorkerThread.cpp b/Source/core/workers/WorkerThread.cpp
index c60511544ab3c579e55ce404dcde5ef77705a1b8..0d686a4e4849831b1d801d8181e7da1def40de0e 100644
--- a/Source/core/workers/WorkerThread.cpp
+++ b/Source/core/workers/WorkerThread.cpp
@@ -145,8 +145,19 @@ void WorkerThread::workerThread()
 #endif
     m_workerGlobalScope = nullptr;
 
+    // Detach the ThreadState, cleaning out the thread's heap by
+    // performing a final GC. The cleanup operation will at the end
+    // assert that the heap is empty, as any surviving objects will
+    // otherwise leak and never be destructed. It is important to
+    // detach while the thread is still valid. In particular,
+    // finalizers for objects in the heap for this thread will need to
+    // access thread local data.
     ThreadState::detach();
 
+    // Notify the proxy that the WorkerGlobalScope has been disposed of.
+    // This can free this thread object, hence it must not be touched afterwards.
+    workerReportingProxy().workerGlobalScopeDestroyed();
+
     // Clean up PlatformThreadData before WTF::WTFThreadData goes away!
     PlatformThreadData::current().destroy();