[page_load_metrics] Add a NavigationThrottle for richer abort metrics

chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc

Index: chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc
diff --git a/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc b/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc
index 8a1c61778cea6c80335479cb87a829bb7e7bd233..325a16980ce94e45854009f1129032459a7400a1 100644
--- a/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc
+++ b/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer_unittest.cc
@@ -21,31 +21,49 @@ class AbortsPageLoadMetricsObserverTest
   }
 };
 
-TEST_F(AbortsPageLoadMetricsObserverTest, UnknownNavigationBeforeCommit) {
+TEST_F(AbortsPageLoadMetricsObserverTest, NewNavigationBeforeCommit) {
   StartNavigation(GURL("https://www.google.com"));
   // Simulate the user performing another navigation before commit.
   NavigateAndCommit(GURL("https://www.example.com"));
   histogram_tester().ExpectTotalCount(
-      internal::kHistogramAbortUnknownNavigationBeforeCommit, 1);
+      internal::kHistogramAbortNewNavigationBeforeCommit, 1);
+}
+
+TEST_F(AbortsPageLoadMetricsObserverTest, ReloadBeforeCommit) {
+  StartNavigation(GURL("https://www.google.com"));
+  // Simulate the user performing another navigation before commit.
+  NavigateWithPageTransitionAndCommit(GURL("https://www.example.com"),
+                                      ui::PAGE_TRANSITION_RELOAD);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramAbortReloadBeforeCommit, 1);
+}
+
+TEST_F(AbortsPageLoadMetricsObserverTest, ForwardBackBeforeCommit) {
+  StartNavigation(GURL("https://www.google.com"));
+  // Simulate the user performing another navigation before commit.
+  NavigateWithPageTransitionAndCommit(GURL("https://www.example.com"),
+                                      ui::PAGE_TRANSITION_FORWARD_BACK);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramAbortForwardBackBeforeCommit, 1);
 }
 
 TEST_F(AbortsPageLoadMetricsObserverTest,
-       UnknownProvisionalNavigationBeforeCommit) {
+       NewProvisionalNavigationBeforeCommit) {
   StartNavigation(GURL("https://www.google.com"));
   StartNavigation(GURL("https://www.example.com"));
   histogram_tester().ExpectTotalCount(
-      internal::kHistogramAbortUnknownNavigationBeforeCommit, 1);
+      internal::kHistogramAbortNewNavigationBeforeCommit, 1);
 }
 
 TEST_F(AbortsPageLoadMetricsObserverTest,
-       UnknownNavigationBeforeCommitNonTrackedPageLoad) {
+       NewNavigationBeforeCommitNonTrackedPageLoad) {
   StartNavigation(GURL("https://www.google.com"));
   // Simulate the user performing another navigation before commit. Navigate to
   // an untracked URL, to verify that we still log abort metrics even if the new
   // navigation isn't tracked.
   NavigateAndCommit(GURL("about:blank"));
   histogram_tester().ExpectTotalCount(
-      internal::kHistogramAbortUnknownNavigationBeforeCommit, 1);
+      internal::kHistogramAbortNewNavigationBeforeCommit, 1);
 }
 
 TEST_F(AbortsPageLoadMetricsObserverTest, NewNavigationBeforePaint) {