Experimental: Remove chromium shared timers

content/renderer/scheduler/renderer_task_queue_selector.cc

Index: content/renderer/scheduler/renderer_task_queue_selector.cc
diff --git a/content/renderer/scheduler/renderer_task_queue_selector.cc b/content/renderer/scheduler/renderer_task_queue_selector.cc
index 7191942cd13ebb8c1c9a037190250236f646d60a..cd8cae0a0917d3f2daf6fda442195e8e3cb01ed4 100644
--- a/content/renderer/scheduler/renderer_task_queue_selector.cc
+++ b/content/renderer/scheduler/renderer_task_queue_selector.cc
@@ -10,7 +10,8 @@
 
 namespace content {
 
-RendererTaskQueueSelector::RendererTaskQueueSelector() : starvation_count_(0) {
+RendererTaskQueueSelector::RendererTaskQueueSelector()
+    : starvation_count_(0), task_queue_selector_observer_(nullptr) {
 }
 
 RendererTaskQueueSelector::~RendererTaskQueueSelector() {
@@ -35,8 +36,10 @@ void RendererTaskQueueSelector::SetQueuePriority(size_t queue_index,
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DCHECK_LT(queue_index, work_queues_.size());
   DCHECK_LT(priority, QUEUE_PRIORITY_COUNT);
-  DisableQueue(queue_index);
+  bool previously_enabled = DisableQueue(queue_index);
   queue_priorities_[priority].insert(queue_index);
+  if (task_queue_selector_observer_ && !previously_enabled)
+    task_queue_selector_observer_->OnTaskQueueEnabled();
 }
 
 void RendererTaskQueueSelector::EnableQueue(size_t queue_index,
@@ -44,12 +47,15 @@ void RendererTaskQueueSelector::EnableQueue(size_t queue_index,
   SetQueuePriority(queue_index, priority);
 }
 
-void RendererTaskQueueSelector::DisableQueue(size_t queue_index) {
+bool RendererTaskQueueSelector::DisableQueue(size_t queue_index) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DCHECK_LT(queue_index, work_queues_.size());
+  bool previously_enabled = false;
   for (auto& queue_priority : queue_priorities_) {
-    queue_priority.erase(queue_index);
+    if (queue_priority.erase(queue_index))
+      previously_enabled = true;
   }
+  return previously_enabled;
 }
 
 bool RendererTaskQueueSelector::IsQueueEnabled(size_t queue_index) const {
@@ -174,4 +180,9 @@ void RendererTaskQueueSelector::AsValueInto(
   state->SetInteger("starvation_count", starvation_count_);
 }
 
+void RendererTaskQueueSelector::RegisterTaskQueueObserver(
+    TaskQueueSelectorObserver* observer) {
+  task_queue_selector_observer_ = observer;
+}
+
 }  // namespace content