[scheduler]: Avoid waking up the scheduler to end long idle periods.

base/trace_event/trace_event.h

Index: base/trace_event/trace_event.h
diff --git a/base/trace_event/trace_event.h b/base/trace_event/trace_event.h
index 2c30b3340a2dd06edf8fcd8290ef96eee0412b16..140aa2c004bfebc7cca840875fa3b6d3b1dc144f 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -760,6 +760,20 @@
         TRACE_EVENT_FLAG_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 
+#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, name, \

[Primiano Tucci (use gerrit), 2015/06/01 17:20:04]

Ok there seems to be enough precedent for this.

Can you just add a comment saying:
// Similar to RACE_EVENT_NESTABLE_ASYNC_{BEGIN,END}X but with a custom
|timestamp| provided.

[rmcilroy, 2015/06/01 19:12:43]

Done.

+        id, timestamp) \
+  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
+        TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id, \
+        static_cast<int>(base::PlatformThread::CurrentId()), timestamp, \
+        TRACE_EVENT_FLAG_NONE)
+
+#define TRACE_EVENT_NESTABLE_ASYNC_END_WITH_TIMESTAMP0(category_group, name, \
+        id, timestamp) \
+  INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
+        TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id, \
+        static_cast<int>(base::PlatformThread::CurrentId()), timestamp, \
+        TRACE_EVENT_FLAG_NONE)
+
 // Records a single NESTABLE_ASYNC_INSTANT event called "name" immediately,
 // with 2 associated arguments. If the category is not enabled, then this
 // does nothing.