POC for InspectorInstrumentation adding InspectorWebPerfAgent

components/scheduler/base/task_queue_manager.cc

Index: components/scheduler/base/task_queue_manager.cc
diff --git a/components/scheduler/base/task_queue_manager.cc b/components/scheduler/base/task_queue_manager.cc
index 08eb78234b31a524623c090ab710d088a18efa28..c176c470d8fbdd198e6fd545a02aad4f15260cf3 100644
--- a/components/scheduler/base/task_queue_manager.cc
+++ b/components/scheduler/base/task_queue_manager.cc
@@ -215,7 +215,15 @@ void TaskQueueManager::DoWork(base::TimeTicks run_time, bool from_main_thread) {
     bool should_trigger_wakeup = work_queue->task_queue()->wakeup_policy() ==
                                  TaskQueue::WakeupPolicy::CAN_WAKE_OTHER_QUEUES;
 
-    switch (ProcessTaskFromWorkQueue(work_queue, &previous_task)) {
+    if (!delegate_->IsNested() && task_time_tracker_)
+      fprintf(stderr, "\n[ TaskQueueMgr::willProcessTask ");
+
+    ProcessTaskResult result = ProcessTaskFromWorkQueue(work_queue, &previous_task);
+
+    if (!delegate_->IsNested() && task_time_tracker_)
+      fprintf(stderr, "TaskQueueMgr::didProcessTask ]\n");
+
+    switch (result) {
       case ProcessTaskResult::DEFERRED:
         // If a task was deferred, try again with another task. Note that this
         // means deferred tasks (i.e. non-nestable tasks) will never trigger