Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/core/dom/TaskRunnerHelper.h

Index: third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
diff --git a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
index d15176dc0dead87715ba29689b25106187b4e8cf..2e4da6bab83f3275cb9d232ea59829d2ef1cbde1 100644
--- a/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
+++ b/third_party/WebKit/Source/core/dom/TaskRunnerHelper.h
@@ -16,6 +16,7 @@ class ExecutionContext;
 class LocalFrame;
 class ScriptState;
 class WebTaskRunner;
+class WorkerOrWorkletGlobalScope;
 
 enum class TaskType : unsigned {
   // Speced tasks and related internal tasks should be posted to one of
@@ -121,6 +122,9 @@ enum class TaskType : unsigned {
   // Tasks that must not be throttled should be posted here, but the usage
   // should be very limited.
   kUnthrottled,
+
+  // A new task type should be added before this.
+  kNumberOfTaskTypes,
 };
 
 // HashTraits for TaskType.
@@ -146,6 +150,8 @@ class CORE_EXPORT TaskRunnerHelper final {
   static RefPtr<WebTaskRunner> Get(TaskType, Document*);
   static RefPtr<WebTaskRunner> Get(TaskType, ExecutionContext*);
   static RefPtr<WebTaskRunner> Get(TaskType, ScriptState*);
+
+  static RefPtr<WebTaskRunner> Get(TaskType, WorkerOrWorkletGlobalScope*);
 };
 
 }  // namespace blink