Make Timer and CancellableTaskFactory embeddeable in lazily swept objects.

Source/platform/scheduler/CancellableTaskFactory.cpp

Index: Source/platform/scheduler/CancellableTaskFactory.cpp
diff --git a/Source/platform/scheduler/CancellableTaskFactory.cpp b/Source/platform/scheduler/CancellableTaskFactory.cpp
index 87027119e635018ae91ce74982b213b780fa0d68..ad461afa77cb7386e0c377367207945fd0d89276 100644
--- a/Source/platform/scheduler/CancellableTaskFactory.cpp
+++ b/Source/platform/scheduler/CancellableTaskFactory.cpp
@@ -21,11 +21,16 @@ WebThread::Task* CancellableTaskFactory::cancelAndCreate()
     return new CancellableTask(m_weakPtrFactory.createWeakPtr());
 }
 
+NO_LAZY_SWEEP_SANITIZE_ADDRESS
 void CancellableTaskFactory::CancellableTask::run()
 {
-    if (m_weakPtr.get()) {
-        Closure* closure = m_weakPtr->m_closure.get();
-        m_weakPtr->m_weakPtrFactory.revokeAll();
+    if (CancellableTaskFactory* taskFactory = m_weakPtr.get()) {
+#if defined(ADDRESS_SANITIZER)
+        if (taskFactory->m_unpoisonBeforeUpdate)
+            ASAN_UNPOISON_MEMORY_REGION(reinterpret_cast<unsigned char*>(taskFactory), sizeof(CancellableTaskFactory));
+#endif
+        Closure* closure = taskFactory->m_closure.get();
+        taskFactory->m_weakPtrFactory.revokeAll();
         (*closure)();
     }
 }