Fix potential DCHECK in TaskQueueThrottler::IncreaseThrottleRefCount

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
index fee7f311ab1eb2885fe4cf5c7f51be0844a82e76..f2c0312d9ca5d383403ffd5c34e20b2e8bb61b5c 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
@@ -803,6 +803,13 @@ void TaskQueueImpl::EnableOrDisableWithSelector(bool enable) {
     return;
 
   if (enable) {
+    if (!main_thread_only().immediate_work_queue->Empty()) {
+      main_thread_only().time_domain->OnQueueHasImmediateWork(this);
+    } else {
+      base::AutoLock lock(any_thread_lock_);
+      if (!any_thread().immediate_incoming_queue.empty())
+        main_thread_only().time_domain->OnQueueHasImmediateWork(this);

[Sami, 2017/02/21 18:21:02]

Should we call this outside the lock? Thinking about re-entrancy...

[alex clarke (OOO till 29th), 2017/02/21 20:52:30]

Done.

+    }
     if (!main_thread_only().delayed_incoming_queue.empty()) {
       main_thread_only().time_domain->ScheduleDelayedWork(
           this,