Add exact version of qcms used by Chrome for testing and comparison

third_party/qcms/src/tests/timing.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the Chromium LICENSE file.
+
+#ifndef TESTS_TIMING_H
+#define TESTS_TIMING_H
+
+#include <assert.h>
+#if defined(_WIN32)
+#include <windows.h>
+#else
+#include <sys/time.h>
+#endif
+#include <time.h>
+
+#if defined(_WIN32)
+
+static double seconds()
+{
+    static double clock_frequency;
+    static bool have_frequency;
+
+    LARGE_INTEGER qpc;
+    QueryPerformanceCounter(&qpc);
+    if (have_frequency)
+        return qpc.QuadPart * clock_frequency;
+
+    have_frequency = true;
+    QueryPerformanceFrequency(&qpc);
+    clock_frequency = 1.0 / (double) qpc.QuadPart;
+    return seconds();
+}
+
+#else
+
+static double seconds()
+{
+    struct timeval now;
+    gettimeofday(&now, 0);
+    return now.tv_sec + now.tv_usec * (1.0 / 1000000.0);
+}
+
+#endif
+
+#define TIME(function, time) do {  \
+    double start = seconds();      \
+    (function);                    \
+    *time += seconds() - start;    \
+} while (0)
+
+#endif // TESTS_TIMING_H