Add crash keys to TaskQueueManager::ProcessTaskFromWorkQueue

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
index 0ebf0ab05dbc9b287384c6ef5b41bd3683e7e720..a6998c7d2bdbc01966a59ec01ab916041c6cd7ef 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
@@ -8,6 +8,7 @@
 #include <set>
 
 #include "base/bind.h"
+#include "base/debug/crash_logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
 #include "platform/scheduler/base/real_time_domain.h"
@@ -317,10 +318,22 @@ TaskQueueManager::ProcessTaskResult TaskQueueManager::ProcessTaskFromWorkQueue(
   internal::TaskQueueImpl::Task pending_task =
       work_queue->TakeTaskFromWorkQueue();
 
+  CHECK(!pending_task.task.is_null()) << "Posted from "

[Sami, 2016/10/31 16:01:53]

Could you also mention here:

// Temporary for https://crbug.com/660427

[alex clarke (OOO till 29th), 2016/11/01 21:55:22]

Done.

+                                      << pending_task.posted_from.ToString();
+
   // It's possible the task was canceled, if so bail out.
   if (pending_task.task.IsCancelled())
     return ProcessTaskResult::EXECUTED;
 
+  static const char kBlinkSchedulerTaskFunctionNameKey[] =
+      "blink_scheduler_task_function_name";
+  static const char kBlinkSchedulerTaskFileNameKey[] =
+      "blink_scheduler_task_file_name";
+  base::debug::ScopedCrashKey debug_task_file_name(
+      kBlinkSchedulerTaskFunctionNameKey, pending_task.posted_from.file_name());
+  base::debug::ScopedCrashKey debug_task_function_name(
+      kBlinkSchedulerTaskFileNameKey, pending_task.posted_from.function_name());
+
   internal::TaskQueueImpl* queue = work_queue->task_queue();
   if (queue->GetQuiescenceMonitored())
     task_was_run_on_quiescence_monitored_queue_ = true;