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

base/trace_event/trace_event.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This header file defines the set of trace_event macros without specifying
 // how the events actually get collected and stored. If you need to expose trace
 // events to some other universe, you can copy-and-paste this file as well as
 // trace_event.h, modifying the macros contained there as necessary for the
 // target platform. The end result is that multiple libraries can funnel events
 // through to a shared trace event collector.
@@ skipping 742 matching lines @@
         category_group, name, id, \
         TRACE_EVENT_FLAG_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, \
         arg1_name, arg1_val, arg2_name, arg2_val)
 #define TRACE_EVENT_COPY_NESTABLE_ASYNC_END_WITH_TTS2(category_group, name, \
         id, arg1_name, arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
         category_group, name, id, \
         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.
 #define TRACE_EVENT_NESTABLE_ASYNC_INSTANT2(category_group, name, id, \
         arg1_name, arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 
 // Records a single FLOW_BEGIN event called "name" immediately, with 0, 1 or 2
@@ skipping 905 matching lines @@
   const char* name_;
   IDType id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_