Report nav timing 2 instance as soon as it's requested.

third_party/WebKit/Source/core/timing/PerformanceNavigationTimingTest.cpp

+// Copyright 2017 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 "core/timing/PerformanceNavigationTiming.h"
+
+#include "core/testing/DummyPageHolder.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class PerformanceNavigationTimingTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
+  }
+
+  AtomicString getNavigationType(NavigationType type, Document* document) {
+    return PerformanceNavigationTiming::getNavigationType(type, document);
+  }
+
+  std::unique_ptr<DummyPageHolder> m_pageHolder;
+};
+
+TEST_F(PerformanceNavigationTimingTest, GetNavigationType) {
+  m_pageHolder->page().setVisibilityState(PageVisibilityStatePrerender, false);
+  AtomicString returnedType =
+      getNavigationType(NavigationTypeBackForward, &m_pageHolder->document());
+  EXPECT_EQ(returnedType, "prerender");
+
+  m_pageHolder->page().setVisibilityState(PageVisibilityStateHidden, false);
+  returnedType =
+      getNavigationType(NavigationTypeBackForward, &m_pageHolder->document());
+  EXPECT_EQ(returnedType, "back_forward");
+
+  m_pageHolder->page().setVisibilityState(PageVisibilityStateVisible, false);
+  returnedType = getNavigationType(NavigationTypeFormResubmitted,
+                                   &m_pageHolder->document());
+  EXPECT_EQ(returnedType, "navigate");
+}
+}  // namespace blink