Reland of Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/core/workers/WorkerThread.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerThread.h b/third_party/WebKit/Source/core/workers/WorkerThread.h
index eba1dc13bc5ce66fc4567d55980072b57275afa6..d8da5e4a5df375042379c522d010894562c4f527 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.h
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.h
@@ -37,6 +37,7 @@
 #include "platform/LifecycleNotifier.h"
 #include "platform/WaitableEvent.h"
 #include "platform/WebTaskRunner.h"
+#include "platform/scheduler/child/worker_global_scope_scheduler.h"
 #include "platform/wtf/Forward.h"
 #include "platform/wtf/Functional.h"
 #include "platform/wtf/PassRefPtr.h"
@@ -92,7 +93,6 @@
 //    If the running task is for debugger, it's guaranteed to finish without
 //    any interruptions.
 //  - Queued tasks never run.
-//  - postTask() and appendDebuggerTask() reject posting new tasks.
 class CORE_EXPORT WorkerThread : public WebThread::TaskObserver {
  public:
   // Represents how this thread is terminated. Used for UMA. Append only.
@@ -137,9 +137,6 @@
     return worker_reporting_proxy_;
   }
 
-  void PostTask(const WebTraceLocation&, std::unique_ptr<WTF::Closure>);
-  void PostTask(const WebTraceLocation&,
-                std::unique_ptr<WTF::CrossThreadClosure>);
   void AppendDebuggerTask(std::unique_ptr<CrossThreadClosure>);
 
   // Runs only debugger tasks while paused in debugger.
@@ -174,6 +171,10 @@
 
   ParentFrameTaskRunners* GetParentFrameTaskRunners() const {
     return parent_frame_task_runners_.Get();
+  }
+
+  scheduler::WorkerGlobalScopeScheduler* GetGlobalScopeScheduler() const {
+    return global_scope_scheduler_.get();
   }
 
  protected:
@@ -243,12 +244,7 @@
   // |m_threadStateMutex| acquired.
   void ForciblyTerminateExecution(const MutexLocker&, ExitCode);
 
-  // Returns true if termination or shutdown sequence has started. This is
-  // thread safe.
-  // Note that this returns false when the sequence has already started but it
-  // hasn't been notified to the calling thread.
-  bool IsInShutdown();
-
+  void InitializeSchedulerOnWorkerThread(WaitableEvent*);
   void InitializeOnWorkerThread(std::unique_ptr<WorkerThreadStartupData>);
   void PrepareForShutdownOnWorkerThread();
   void PerformShutdownOnWorkerThread();
@@ -294,7 +290,13 @@
 
   RefPtr<WorkerLoaderProxy> worker_loader_proxy_;
   WorkerReportingProxy& worker_reporting_proxy_;
+
   CrossThreadPersistent<ParentFrameTaskRunners> parent_frame_task_runners_;
+
+  // Tasks managed by this scheduler are canceled when the global scope is
+  // closed.
+  std::unique_ptr<scheduler::WorkerGlobalScopeScheduler>
+      global_scope_scheduler_;
 
   // This lock protects |m_globalScope|, |m_requestedToTerminate|,
   // |m_threadState|, |m_runningDebuggerTask| and |m_exitCode|.