Have all trace points emit to ETW.

base/debug/trace_event_win.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 file contains the Windows-specific declarations for trace_event.h.
 #ifndef BASE_DEBUG_TRACE_EVENT_WIN_H_
 #define BASE_DEBUG_TRACE_EVENT_WIN_H_
 
 #include <string>
 
 #include "base/base_export.h"
 #include "base/debug/trace_event.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/win/event_trace_provider.h"
 
 // Fwd.
 template <typename Type>
 struct StaticMemorySingletonTraits;
 
 namespace base {
 namespace debug {
 
 // This EtwTraceProvider subclass implements ETW logging
@@ skipping 28 matching lines @@
 
   // Allows passing extra as a const char* to avoid constructing temporary
   // std::string instances where not needed.
   static void Trace(const char* name,
                     char type,
                     const void* id,
                     const char* extra) {
     return Trace(name, -1, type, id, extra, -1);
   }
 
+  // Allows passing extra as a set of arguments that will be converted to
+  // a string.

[chrisha, 2013/09/05 20:21:30]

This is a complicated call. Worth documenting the arguments?

[fdoray, 2013/09/08 18:35:50]

Done.

+  static void TraceWithArgs(
+      const char* category_group,
+      const char* name,
+      char type,
+      const void* id,
+      int num_args,
+      const char** arg_names,
+      const unsigned char* arg_types,
+      const unsigned long long* arg_values,
+      scoped_ptr<ConvertableToTraceFormat> convertable_values[]);
+
   // Retrieves the singleton.
   // Note that this may return NULL post-AtExit processing.
   static TraceEventETWProvider* GetInstance();
 
   // Returns true iff tracing is turned on.
   bool IsTracing() {
     return enable_level() >= TRACE_LEVEL_INFORMATION;
   }
 
   // Emit a trace of type |type| containing |name|, |id|, and |extra|.
@@ skipping 43 matching lines @@
 // The "name" string as a zero-terminated ASCII string.
 // The id pointer in the machine bitness.
 // The "extra" string as a zero-terminated ASCII string.
 // Optionally the stack trace, consisting of a DWORD "depth", followed
 //    by an array of void* (machine bitness) of length "depth".
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_TRACE_EVENT_WIN_H_