Import Traceline, a Windows performance trace event logger.

tools/traceline/traceline/logging.h

Index: tools/traceline/traceline/logging.h
diff --git a/tools/traceline/traceline/logging.h b/tools/traceline/traceline/logging.h
new file mode 100755
index 0000000000000000000000000000000000000000..bf2e4fa068407cf0703bda72ec34ab3ccf680046
--- /dev/null
+++ b/tools/traceline/traceline/logging.h
@@ -0,0 +1,28 @@
+// Copyright (c) 2009 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.
+
+#ifndef TRACELINE_LOGGING_H_
+#define TRACELINE_LOGGING_H_
+
+#include <windows.h>
+#include <stdio.h>
+
+#define CHECK(exp, ...) \
+  if (!(exp)) { \
+    printf("FAILED CHECK: %s\n  %s:%d\n", #exp, __FILE__, __LINE__); \
+    printf("\naborted.\n"); \
+    if (::IsDebuggerPresent()) __debugbreak(); \
+    exit(1); \
+  }
+
+#define NOTREACHED(...) \
+  if (1) { \
+    printf("NOTREACHED:\n  %s:%d\n", __FILE__, __LINE__); \
+    printf(__VA_ARGS__); \
+    printf("\naborted.\n"); \
+    if (::IsDebuggerPresent()) __debugbreak(); \
+    exit(1); \
+  }
+
+#endif  // TRACELINE_LOGGING_H_