Use a monotonic clock (TimeTicks) to report network times to WebCore.

webkit/glue/weburlloader_impl_unittest.cc

+// Copyright (c) 2011 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.
+
+#include "base/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebURLLoadTiming.h"
+#include "webkit/glue/resource_loader_bridge.h"
+#include "webkit/glue/weburlloader_impl.h"
+
+using base::TimeTicks;
+using WebKit::WebURLLoadTiming;
+
+namespace webkit_glue {
+
+struct TestParams {
+  int64 initiation_time;
+  int64 start_time;
+  int64 end_time;
+  int64 callback_time;
+  int64 net_base_time;
+  int64 net_test_delta;
+};
+
+WebURLLoadTiming RunTest(const TestParams& params) {
+  ResourceLoadTimingInfo timing_info;
+  timing_info.base_ticks = TimeTicks::FromInternalValue(params.net_base_time);
+  timing_info.proxy_start = params.net_test_delta;
+  timing_info.proxy_end = 0;
+  timing_info.dns_start = 0;
+  timing_info.dns_end = 0;
+  timing_info.connect_start = 0;
+  timing_info.connect_end = 0;
+  timing_info.ssl_start = 0;
+  timing_info.ssl_end = 0;
+  timing_info.send_start = 0;
+  timing_info.send_end = 0;
+  timing_info.receive_headers_end = 0;
+
+  return PopulateWebURLLoadTiming(
+      timing_info,
+      TimeTicks::FromInternalValue(params.initiation_time),
+      TimeTicks::FromInternalValue(params.start_time),
+      TimeTicks::FromInternalValue(params.end_time),
+      TimeTicks::FromInternalValue(params.callback_time));
+}
+
+TEST(PopulateWebURLLoadTiming, NoSkew) {
+  // All times are monotonic, so no adjustment should occur.
+  TestParams p;
+  p.initiation_time = 0;
+  p.start_time = 1;
+  p.end_time = 4;
+  p.callback_time = 5;
+  p.net_base_time = 2;
+  p.net_test_delta = 1;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(2.0e-6, timing.requestTime());
+  EXPECT_EQ(1, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, DoubleEndedSkew) {
+  // |start_time| occurs before |initiation_time| and |end_time| occurs after
+  // |callback_time|. We must adjust both bounds and scale down the delta.
+  // |net_base_time| is on the midpoint, so it doesn't change. The ratio of
+  // local time to network time is 1:2, so we scale |net_test_delta| by half.
+  TestParams p;
+  p.initiation_time = 2;
+  p.start_time = 0;
+  p.end_time = 8;
+  p.callback_time = 6;
+  p.net_base_time = 4;
+  p.net_test_delta = 2;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(4.0e-6, timing.requestTime());
+  EXPECT_EQ(1, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, FrontEndSkew) {
+  // |end_time| is coherent, but |start_time| is not. So we adjust the lower
+  // bound and move |net_base_time| out. The scale factor is 2:3, but since we
+  // use integers, the numbers truncate from 3.33 to 3 and 1.33 to 1.
+  TestParams p;
+  p.initiation_time = 2;
+  p.start_time = 0;
+  p.end_time = 6;
+  p.callback_time = 6;
+  p.net_base_time = 2;
+  p.net_test_delta = 2;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(3.0e-6, timing.requestTime());
+  EXPECT_EQ(1, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, BackEndSkew) {
+  // Like the previous test, but |start_time| is coherent and |end_time| is
+  // skewed.
+  TestParams p;
+  p.initiation_time = 0;
+  p.start_time = 0;
+  p.end_time = 6;
+  p.callback_time = 4;
+  p.net_base_time = 2;
+  p.net_test_delta = 2;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(1.0e-6, timing.requestTime());
+  EXPECT_EQ(1, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, Instantaneous) {
+  // The bounds are all okay, but the |start_time| and |end_time| have the same
+  // value. No adjustments should be made and no divide-by-zero errors should
+  // occur.
+  TestParams p;
+  p.initiation_time = 0;
+  p.start_time = 1;
+  p.end_time = 1;
+  p.callback_time = 2;
+  p.net_base_time = 1;
+  p.net_test_delta = 0;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(1.0e-6, timing.requestTime());
+  EXPECT_EQ(0, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, DisjointInstantaneous) {
+  // |initiation_time| and |callback_time| are the same. No matter what the
+  // other values are, they must fit withing [iniation_time, callback_time]. So,
+  // all of the values should be adjusted so they are exactly that value.
+  TestParams p;
+  p.initiation_time = 1;
+  p.start_time = 2;
+  p.end_time = 2;
+  p.callback_time = 1;
+  p.net_base_time = 2;
+  p.net_test_delta = 1;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(1.0e-6, timing.requestTime());
+  EXPECT_EQ(0, timing.proxyStart());
+}
+
+}  // namespace webkit_glue