Add granular file tracing.

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 684 matching lines @@
 // - |id| is used to match a child NESTABLE_ASYNC event with its parent
 //   NESTABLE_ASYNC event. Therefore, events in the same nested event tree must
 //   be logged using the same id and category_group.
 //
 // Unmatched NESTABLE_ASYNC_END event will be parsed as an event that starts
 // at the first NESTABLE_ASYNC event of that id, and unmatched
 // NESTABLE_ASYNC_BEGIN event will be parsed as an event that ends at the last
 // NESTABLE_ASYNC event of that id. Corresponding warning messages for
 // unmatched events will be shown in the analysis view.
 
-// Records a single NESTABLE_ASYNC_BEGIN event called "name" immediately, with 2
-// associated arguments. If the category is not enabled, then this does nothing.
+// Records a single NESTABLE_ASYNC_BEGIN event called "name" immediately, with 1
+// or 2 associated arguments. If the category is not enabled, then this does
+// nothing.
+#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(category_group, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
+        category_group, name, id, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(category_group, name, id, arg1_name, \
+        arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
+        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
-// Records a single NESTABLE_ASYNC_END event called "name" immediately, with 2
-// associated arguments. If the category is not enabled, then this does nothing.
+// Records a single NESTABLE_ASYNC_END event called "name" immediately, with 1
+// or 2 associated arguments. If the category is not enabled, then this does
+// nothing.
+#define TRACE_EVENT_NESTABLE_ASYNC_END0(category_group, name, id) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
+        category_group, name, id, TRACE_EVENT_FLAG_NONE)
+#define TRACE_EVENT_NESTABLE_ASYNC_END1(category_group, name, id, arg1_name, \
+        arg1_val) \
+    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
+        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_NESTABLE_ASYNC_END2(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_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
 // 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) \
@@ skipping 909 matching lines @@
   const char* name_;
   IDType id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_