[scheduler] Add options to TaskQueue::InsertFence

third_party/WebKit/Source/platform/scheduler/base/work_queue.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/scheduler/base/work_queue.h"
 
 #include "platform/scheduler/base/work_queue_sets.h"
 
 namespace blink {
 namespace scheduler {
@@ skipping 113 matching lines @@
 void WorkQueue::AssignToWorkQueueSets(WorkQueueSets* work_queue_sets) {
   work_queue_sets_ = work_queue_sets;
 }
 
 void WorkQueue::AssignSetIndex(size_t work_queue_set_index) {
   work_queue_set_index_ = work_queue_set_index;
 }
 
 bool WorkQueue::InsertFence(EnqueueOrder fence) {
   DCHECK_NE(fence, 0u);
-  DCHECK_GE(fence, fence_);
+  DCHECK(fence >= fence_ || fence == 1u);
   bool was_blocked_by_fence = BlockedByFence();
   fence_ = fence;
   // Moving the fence forward may unblock some tasks.
   if (work_queue_sets_ && !work_queue_.empty() && was_blocked_by_fence &&
       !BlockedByFence()) {
     work_queue_sets_->OnPushQueue(this);
     return true;
   }
+  // Fence insertion may have blocked all tasks in this work queue.
+  if (BlockedByFence())
+    work_queue_sets_->OnQueueBlocked(this);
   return false;
 }
 
 bool WorkQueue::RemoveFence() {
   bool was_blocked_by_fence = BlockedByFence();
   fence_ = 0;
   if (work_queue_sets_ && !work_queue_.empty() && was_blocked_by_fence) {
     work_queue_sets_->OnPushQueue(this);
     return true;
   }
   return false;
 }
 
 bool WorkQueue::ShouldRunBefore(const WorkQueue* other_queue) const {
   DCHECK(!work_queue_.empty());
   DCHECK(!other_queue->work_queue_.empty());
   EnqueueOrder enqueue_order = 0;
   EnqueueOrder other_enqueue_order = 0;
   bool have_task = GetFrontTaskEnqueueOrder(&enqueue_order);
   bool have_other_task =
       other_queue->GetFrontTaskEnqueueOrder(&other_enqueue_order);
   DCHECK(have_task);
   DCHECK(have_other_task);
   return enqueue_order < other_enqueue_order;
 }
 
 }  // namespace internal
 }  // namespace scheduler
 }  // namespace blink