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 ipc_request_time;
+  int64 net_start_time;
+  int64 net_end_time;
+  int64 ipc_response_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.ipc_request_time),
+      TimeTicks::FromInternalValue(params.net_start_time),
+      TimeTicks::FromInternalValue(params.net_end_time),
+      TimeTicks::FromInternalValue(params.ipc_response_time));
+}
+
+TEST(PopulateWebURLLoadTiming, NoSkew) {
+  // All times are monotonic, so no adjustment should occur.
+  TestParams p;
+  p.ipc_request_time = 0;
+  p.net_start_time = 1;
+  p.net_end_time = 4;
+  p.ipc_response_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, OffsetMidpoints) {
+  // All times are monotonic, but not centered. Adjust the |net_*| times so they
+  // are centered within the |ipc_*| times.
+  TestParams p;
+  p.ipc_request_time = 0;
+  p.net_start_time = 2;
+  p.net_end_time = 5;
+  p.ipc_response_time = 5;
+  p.net_base_time = 3;
+  p.net_test_delta = 1;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(2.0e-6, timing.requestTime());
+  EXPECT_EQ(1, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, DoubleEndedSkew) {
+  // |net_start_time| occurs before |ipc_request_time| and |net_end_time| occurs
+  // after |ipc_response_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.ipc_request_time = 2;
+  p.net_start_time = 0;
+  p.net_end_time = 8;
+  p.ipc_response_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) {
+  // |net_end_time| is coherent, but |net_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.ipc_request_time = 2;
+  p.net_start_time = 0;
+  p.net_end_time = 6;
+  p.ipc_response_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 |net_start_time| is coherent and |net_end_time|
+  // is skewed.
+  TestParams p;
+  p.ipc_request_time = 0;
+  p.net_start_time = 0;
+  p.net_end_time = 6;
+  p.ipc_response_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 |net_start_time| and |net_end_time| have
+  // the same value. No adjustments should be made and no divide-by-zero errors
+  // should occur.
+  TestParams p;
+  p.ipc_request_time = 0;
+  p.net_start_time = 1;
+  p.net_end_time = 1;
+  p.ipc_response_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, OffsetInstantaneous) {
+  // The bounds are all okay, but the |net_start_time| and |net_end_time| have
+  // the same value and are offset from the midpoint of |ipc_request_time| and
+  // |ipc_response_time|. An offset should be applied to make the midpoints line
+  // up.
+  TestParams p;
+  p.ipc_request_time = 0;
+  p.net_start_time = 2;
+  p.net_end_time = 2;
+  p.ipc_response_time = 2;
+  p.net_base_time = 2;
+  p.net_test_delta = 0;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(1.0e-6, timing.requestTime());
+  EXPECT_EQ(0, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, DisjointInstantaneous) {
+  // |ipc_request_time| and |ipc_response_time| are the same. No matter what the
+  // other values are, they must fit within [ipc_request_time,
+  // ipc_response_time].  So, all of the values should be adjusted so they are
+  // exactly that value.
+  TestParams p;
+  p.ipc_request_time = 1;
+  p.net_start_time = 2;
+  p.net_end_time = 2;
+  p.ipc_response_time = 1;
+  p.net_base_time = 2;
+  p.net_test_delta = 0;
+  WebURLLoadTiming timing = RunTest(p);
+  EXPECT_EQ(1.0e-6, timing.requestTime());
+  EXPECT_EQ(0, timing.proxyStart());
+}
+
+TEST(PopulateWebURLLoadTiming, RoundingNearEdges) {
+  // Verify that rounding never causes a value to appear outside the given
+  // |ipc_*| range.
+  const int kMaxRange = 100;
+  for (int i = 0; i < kMaxRange; ++i) {
+    for (int j = 0; j < kMaxRange; ++j) {
+      TestParams p;
+      p.ipc_request_time = 0;
+      p.net_start_time = 0;
+      p.net_end_time = j;
+      p.ipc_response_time = i;
+      p.net_base_time = 0;
+      p.net_test_delta = j;
+      WebURLLoadTiming timing = RunTest(p);
+      EXPECT_LE(0.0e-6, timing.requestTime());
+      EXPECT_GE(i, timing.proxyStart());
+    }
+  }
+}
+
+}  // namespace webkit_glue