[scheduler] Fix TaskQueueThrottler::SetQueueEnabled logic.

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..5c9fc41815c06af0e9743e4c9ce35bccf6240ca4 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
@@ -8,7 +8,9 @@
 #include <set>
 
 #include "base/bind.h"
+#include "base/format_macros.h"
 #include "base/metrics/histogram_macros.h"
+#include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "platform/scheduler/base/real_time_domain.h"
 #include "platform/scheduler/base/task_queue_impl.h"
@@ -48,8 +50,14 @@ base::RepeatingClosure UnsafeConvertOnceClosureToRepeating(
   return base::BindRepeating([](base::OnceClosure cb) { std::move(cb).Run(); },
                              base::Passed(&cb));
 }
+
+std::string PointerToId(void* pointer) {

[alex clarke (OOO till 29th), 2016/11/24 14:45:07]

Can we land this separately?  It seems unrelated to the fix.

[altimin, 2016/11/24 15:00:55]

Oops, sorry.

+  return base::StringPrintf(
+      "%" PRIx64, static_cast<uint64_t>(reinterpret_cast<uintptr_t>(pointer)));
 }
 
+}  // namespace
+
 TaskQueueManager::TaskQueueManager(
     scoped_refptr<TaskQueueManagerDelegate> delegate,
     const char* tracing_category,
@@ -347,8 +355,8 @@ TaskQueueManager::ProcessTaskResult TaskQueueManager::ProcessTaskFromWorkQueue(
       observer.WillProcessTask(pending_task);
     queue->NotifyWillProcessTask(pending_task);
   }
-  TRACE_EVENT1(tracing_category_, "TaskQueueManager::RunTask", "queue",
-               queue->GetName());
+  TRACE_EVENT2(tracing_category_, "TaskQueueManager::RunTask", "queue",
+               queue->GetName(), "queue_id", PointerToId(queue));
   // NOTE when TaskQueues get unregistered a reference ends up getting retained
   // by |queues_to_delete_| which is cleared at the top of |DoWork|. This means
   // we are OK to use raw pointers here.