Add thread affinity and ASSERT() for same-thread restriction to WTF::Function

third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h

Index: third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h
diff --git a/third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h b/third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h
index 46c26bde430fefa346156e5aa1b954e3c0d361ff..8b54a781330c8a2958b95bfcf92ffcdbcddeb299 100644
--- a/third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h
+++ b/third_party/WebKit/Source/platform/scheduler/CancellableTaskFactory.h
@@ -29,7 +29,7 @@ public:
     // CancellableTaskFactory, and one when that owning object isn't controlled
     // by Oilpan.
     //
-    // In the Oilpan case, as WTF::Closure objects are off-heap, we have to construct the
+    // In the Oilpan case, as WTF::SameThreadClosure objects are off-heap, we have to construct the
     // closure in such a manner that it doesn't end up referring back to the owning heap
     // object with a strong Persistent<> GC root reference. If we do, this will create
     // a heap <-> off-heap cycle and leak, the owning object can never be GCed.
@@ -62,7 +62,7 @@ public:
 protected:
     // Only intended used by unit tests wanting to stack allocate and/or pass in a closure value.
     // Please use the create() factory method elsewhere.
-    explicit CancellableTaskFactory(PassOwnPtr<Closure> closure)
+    explicit CancellableTaskFactory(PassOwnPtr<SameThreadClosure> closure)
         : m_closure(std::move(closure))
         , m_weakPtrFactory(this)
     {
@@ -85,7 +85,7 @@ private:
         WeakPtr<CancellableTaskFactory> m_weakPtr;
     };
 
-    OwnPtr<Closure> m_closure;
+    OwnPtr<SameThreadClosure> m_closure;
     WeakPtrFactory<CancellableTaskFactory> m_weakPtrFactory;
 };