cc: Implement states for Task for stricter control.

content/renderer/raster_worker_pool.cc

Index: content/renderer/raster_worker_pool.cc
diff --git a/content/renderer/raster_worker_pool.cc b/content/renderer/raster_worker_pool.cc
index 7abe23c289e7f31844326e164d1a72e282ff6eae..8c50e01b3b973bb989c8ace4a570f6289b814d5c 100644
--- a/content/renderer/raster_worker_pool.cc
+++ b/content/renderer/raster_worker_pool.cc
@@ -352,18 +352,12 @@ void RasterWorkerPool::RunTaskInCategoryWithLockAcquired(
   // There may be more work available, so wake up another worker thread.
   SignalHasReadyToRunTasksWithLockAcquired();
 
-  // Call WillRun() before releasing |lock_| and running task.
-  task->WillRun();
-
   {
     base::AutoUnlock unlock(lock_);
 
     task->RunOnWorkerThread();
   }
 
-  // This will mark task as finished running.
-  task->DidRun();
-
   work_queue_.CompleteTask(prioritized_task);
 
   // If namespace has finished running all tasks, wake up origin threads.