Worker: Fix cross-thread violations on ObjectProxy

third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h

Index: third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h b/third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h
index 71e434c714391e72c09bc1f3d33e031a5549a422..4c04c47f9f4515c36c1676144b3238e66ff7c13d 100644
--- a/third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorkletObjectProxy.h
@@ -14,8 +14,8 @@ namespace blink {
 
 class ThreadedWorkletMessagingProxy;
 
-// A proxy to talk to the parent worklet object. This object is created on the
-// main thread, passed on to the worklet thread, and used just to proxy
+// A proxy to talk to the parent worklet object. This object is created and
+// destroyed on the main thread, and used on the worklet thread for proxying
 // messages to the ThreadedWorkletMessagingProxy on the main thread.
 // ThreadedWorkletMessagingProxy always outlives this proxy.
 class CORE_EXPORT ThreadedWorkletObjectProxy : public WorkerReportingProxy {
@@ -24,7 +24,8 @@ class CORE_EXPORT ThreadedWorkletObjectProxy : public WorkerReportingProxy {
 
  public:
   static std::unique_ptr<ThreadedWorkletObjectProxy> create(
-      const WeakPtr<ThreadedWorkletMessagingProxy>&);
+      const WeakPtr<ThreadedWorkletMessagingProxy>&,
+      ParentFrameTaskRunners*);
   ~ThreadedWorkletObjectProxy() override;
 
   void reportPendingActivity(bool hasPendingActivity);
@@ -47,13 +48,18 @@ class CORE_EXPORT ThreadedWorkletObjectProxy : public WorkerReportingProxy {
   void didTerminateWorkerThread() override;
 
  protected:
-  ThreadedWorkletObjectProxy(const WeakPtr<ThreadedWorkletMessagingProxy>&);
+  ThreadedWorkletObjectProxy(const WeakPtr<ThreadedWorkletMessagingProxy>&,
+                             ParentFrameTaskRunners*);
 
  private:
   // No guarantees about the lifetimes of tasks posted by this proxy wrt the
   // ThreadedWorkletMessagingProxy so a weak pointer must be used when posting
   // the tasks.
   WeakPtr<ThreadedWorkletMessagingProxy> m_messagingProxyWeakPtr;
+
+  // Used to post a task to ThreadedWorkletMessagingProxy on the parent context
+  // thread.
+  CrossThreadPersistent<ParentFrameTaskRunners> m_parentFrameTaskRunners;
 };
 
 }  // namespace blink