Add PageLoad metrics for multi-tab loading cases

chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer_unittest.cc

Index: chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer_unittest.cc
diff --git a/chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer_unittest.cc b/chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d47dbb2ac94b18d02e6a9dd2b21aa10ccc119094
--- /dev/null
+++ b/chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer_unittest.cc
@@ -0,0 +1,138 @@
+// 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 "chrome/browser/page_load_metrics/observers/multi_tab_loading_page_load_metrics_observer.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/optional.h"
+#include "chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.h"
+
+namespace {
+
+const char kDefaultTestUrl[] = "https://google.com";
+
+class TestMultiTabLoadingPageLoadMetricsObserver
+    : public MultiTabLoadingPageLoadMetricsObserver {
+ public:
+  explicit TestMultiTabLoadingPageLoadMetricsObserver(bool multi_tab_loading)
+      : multi_tab_loading_(multi_tab_loading) {}
+  ~TestMultiTabLoadingPageLoadMetricsObserver() override {}
+
+ private:
+  bool IsAnyTabLoading(content::NavigationHandle* navigation_handle) override {
+    return multi_tab_loading_;
+  }
+
+  const bool multi_tab_loading_;
+};
+
+}  // namespace
+
+class MultiTabLoadingPageLoadMetricsObserverTest
+    : public page_load_metrics::PageLoadMetricsObserverTestHarness {
+ public:
+  enum UseCase { SingleTabLoading, MultiTabLoading };
+  enum TabState { Foreground, Background };
+
+  void SimulatePageLoad(UseCase use_case, TabState tab_state) {
+    use_case_ = use_case;
+
+    page_load_metrics::mojom::PageLoadTiming timing;
+    page_load_metrics::InitPageLoadTimingForTest(&timing);
+    timing.navigation_start = base::Time::FromDoubleT(1);
+    timing.paint_timing->first_contentful_paint =
+        base::TimeDelta::FromMilliseconds(300);
+    timing.paint_timing->first_meaningful_paint =
+        base::TimeDelta::FromMilliseconds(700);
+    timing.document_timing->dom_content_loaded_event_start =
+        base::TimeDelta::FromMilliseconds(600);
+    timing.document_timing->load_event_start =
+        base::TimeDelta::FromMilliseconds(1000);
+    PopulateRequiredTimingFields(&timing);
+
+    if (tab_state == Background) {
+      // Start in background.
+      web_contents()->WasHidden();
+    }
+
+    NavigateAndCommit(GURL(kDefaultTestUrl));
+
+    if (tab_state == Background) {
+      // Foreground the tab.
+      web_contents()->WasShown();
+    }
+
+    SimulateTimingUpdate(timing);
+  }
+
+ protected:
+  void RegisterObservers(page_load_metrics::PageLoadTracker* tracker) override {
+    tracker->AddObserver(
+        base::MakeUnique<TestMultiTabLoadingPageLoadMetricsObserver>(
+            use_case_.value() == MultiTabLoading));
+  }
+
+ private:
+  base::Optional<UseCase> use_case_;
+};
+
+TEST_F(MultiTabLoadingPageLoadMetricsObserverTest, SingleTabLoading) {
+  SimulatePageLoad(SingleTabLoading, Foreground);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstContentfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstContentfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstMeaningfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstMeaningfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingDomContentLoaded, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingDomContentLoaded, 0);
+  histogram_tester().ExpectTotalCount(internal::kHistogramMultiTabLoadingLoad,
+                                      0);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingLoad, 0);
+}
+
+TEST_F(MultiTabLoadingPageLoadMetricsObserverTest, MultiTabLoading) {
+  SimulatePageLoad(MultiTabLoading, Foreground);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstContentfulPaint, 1);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstContentfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstMeaningfulPaint, 1);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstMeaningfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingDomContentLoaded, 1);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingDomContentLoaded, 0);
+  histogram_tester().ExpectTotalCount(internal::kHistogramMultiTabLoadingLoad,
+                                      1);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingLoad, 0);
+}
+
+TEST_F(MultiTabLoadingPageLoadMetricsObserverTest, MultiTabBackground) {
+  SimulatePageLoad(MultiTabLoading, Background);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstContentfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstContentfulPaint, 1);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingFirstMeaningfulPaint, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingForegroundToFirstMeaningfulPaint, 1);
+  histogram_tester().ExpectTotalCount(
+      internal::kHistogramMultiTabLoadingDomContentLoaded, 0);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingDomContentLoaded, 1);
+  histogram_tester().ExpectTotalCount(internal::kHistogramMultiTabLoadingLoad,
+                                      0);
+  histogram_tester().ExpectTotalCount(
+      internal::kBackgroundHistogramMultiTabLoadingLoad, 1);
+}