Add detailed tracking for causes of invalid PageLoadTimings.

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

 // 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 LICENSE file.
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/test/histogram_tester.h"
 #include "base/time/time.h"
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 #include "chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.h"
@@ skipping 481 matching lines @@
   // documents with non-well-formed XML on the blink side. See crbug.com/627607
   // for more.
   ui_test_utils::NavigateToURL(
       browser(),
       embedded_test_server()->GetURL("/page_load_metrics/badxml.xhtml"));
 
   timing_observer->WaitForMatchingIPC();
 
   histogram_tester_.ExpectTotalCount(internal::kHistogramFirstLayout, 0);
   histogram_tester_.ExpectTotalCount(internal::kHistogramFirstPaint, 0);
+  histogram_tester_.ExpectTotalCount(page_load_metrics::internal::kErrorEvents,
+                                     1);
   histogram_tester_.ExpectBucketCount(
       page_load_metrics::internal::kErrorEvents,
       page_load_metrics::ERR_BAD_TIMING_IPC_INVALID_TIMING, 1);
+
+  histogram_tester_.ExpectTotalCount(
+      page_load_metrics::internal::kPageLoadTimingStatus, 1);
+  histogram_tester_.ExpectBucketCount(
+      page_load_metrics::internal::kPageLoadTimingStatus,
+      page_load_metrics::internal::INVALID_ORDER_FIRST_LAYOUT_FIRST_PAINT, 1);
 }
 
 // Test code that aborts provisional navigations.
 // TODO(csharrison): Move these to unit tests once the navigation API in content
 // properly calls NavigationHandle/NavigationThrottle methods.
 IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest, AbortNewNavigation) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   GURL url(embedded_test_server()->GetURL("/title1.html"));
   chrome::NavigateParams params(browser(), url, ui::PAGE_TRANSITION_LINK);
@@ skipping 254 matching lines @@
   ui_test_utils::NavigateToURL(browser(), embedded_test_server()->GetURL(
                                               "/page_load_metrics/large.html"));
   NavigateToUntrackedUrl();
 
   histogram_tester_.ExpectTotalCount(internal::kHistogramTotalBytes, 1);
 
   // Verify that there is a single sample recorded in the 10kB bucket (the size
   // of the main HTML response).
   histogram_tester_.ExpectBucketCount(internal::kHistogramTotalBytes, 10, 1);
 }