[page_load_metrics] User Initiated Abort Tracking (Observer version)

components/page_load_metrics/browser/metrics_web_contents_observer_unittest.cc

 // Copyright (c) 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 "components/page_load_metrics/browser/metrics_web_contents_observer.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/process/kill.h"
 #include "base/test/histogram_tester.h"
 #include "base/time/time.h"
@@ skipping 456 matching lines @@
   content::RenderFrameHostTester* rfh_tester =
       content::RenderFrameHostTester::For(main_rfh());
   rfh_tester->SimulateNavigationError(GURL(kDefaultTestUrl), net::ERR_ABORTED);
   rfh_tester->SimulateNavigationStop();
 
   CheckProvisionalEvent(PROVISIONAL_LOAD_ERR_FAILED_NON_ABORT, 0, false);
   CheckProvisionalEvent(PROVISIONAL_LOAD_ERR_ABORTED, 1, false);
   CheckTotalEvents();
 }
 
+TEST_F(MetricsWebContentsObserverTest, BackgroundBeforePaint) {
+  page_load_metrics::PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_paint = base::TimeDelta::FromSeconds(10);
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL("https://www.google.com"));
+  // Background the tab and go for a coffee or something.
+  observer_->WasHidden();
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      main_rfh());
+  // Come back and start browsing again.
+  observer_->WasShown();
+  // Simulate the user performaning another navigation.
+  web_contents_tester->NavigateAndCommit(GURL("https://www.example.com"));
+  histogram_tester_.ExpectTotalCount(kHistogramBackgroundBeforePaint, 1);
+}
+
 TEST_F(MetricsWebContentsObserverTest, AbortProvisionalLoadInBackground) {
   content::WebContentsTester* web_contents_tester =
       content::WebContentsTester::For(web_contents());
 
   observer_->WasHidden();
   web_contents_tester->StartNavigation(GURL(kDefaultTestUrl));
   content::RenderFrameHostTester* rfh_tester =
       content::RenderFrameHostTester::For(main_rfh());
   rfh_tester->SimulateNavigationError(GURL(kDefaultTestUrl), net::ERR_ABORTED);
   rfh_tester->SimulateNavigationStop();
@@ skipping 224 matching lines @@
   EXPECT_NE(string_it, sample_obj->string_fields.end());
   EXPECT_EQ(rappor::GetDomainAndRegistrySampleFromGURL(GURL(kDefaultTestUrl)),
             string_it->second);
 
   const auto& flag_it = sample_obj->flag_fields.find("IsSlow");
   EXPECT_NE(flag_it, sample_obj->flag_fields.end());
   EXPECT_EQ(0u, flag_it->second);
 }
 
 }  // namespace page_load_metrics