PageLoadMetrics renderer and browser implementation.

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"
+#include "components/page_load_metrics/common/page_load_metrics_messages.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/test/test_renderer_host.h"
+#include "content/public/test/web_contents_tester.h"
+
+namespace page_load_metrics {
+
+namespace {
+
+const char kDefaultTestUrl[] = "https://google.com";
+const char kDefaultTestUrlAnchor[] = "https://google.com#samepage";
+const char kDefaultTestUrl2[] = "https://whatever.com";
+
+}  //  namespace
+
+class MetricsWebContentsObserverTest
+    : public content::RenderViewHostTestHarness {
+ public:
+  const char* kHistogramNameFirstLayout =
+      "PageLoad.Timing.Navigation.To.FirstLayout";

[Alexei Svitkine (slow), 2015/09/18 16:38:25]

Nit: Put these in the anon namespace at the top with the other constants and use
the "const char kFoo[]" syntax to define them.

+  const char* kHistogramNameDomContent =
+      "PageLoad.Timing.Navigation.To.DOMContentLoadedEventFired";
+  const char* kHistogramNameLoad =
+      "PageLoad.Timing.Navigation.To.LoadEventFired";
+
+  MetricsWebContentsObserverTest() {}
+
+  void SetUp() override {
+    RenderViewHostTestHarness::SetUp();
+    observer_ = make_scoped_ptr(new MetricsWebContentsObserver(web_contents()));
+  }
+
+  void AssertNoHistogramsLogged() {
+    histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 0);
+    histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 0);
+    histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 0);
+  }
+
+ protected:
+  base::HistogramTester histogram_tester_;
+  scoped_ptr<MetricsWebContentsObserver> observer_;
+};
+
+TEST_F(MetricsWebContentsObserverTest, NoMetrics) {
+  AssertNoHistogramsLogged();
+}
+
+TEST_F(MetricsWebContentsObserverTest, NotInMainFrame) {
+  base::TimeDelta first_layout = base::TimeDelta::FromMilliseconds(1);
+
+  PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_layout = first_layout;
+
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  content::RenderFrameHostTester* rfh_tester =
+      content::RenderFrameHostTester::For(main_rfh());
+  content::RenderFrameHost* subframe = rfh_tester->AppendChild("subframe");
+
+  content::RenderFrameHostTester* subframe_tester =
+      content::RenderFrameHostTester::For(subframe);
+  subframe_tester->SimulateNavigationStart(GURL(kDefaultTestUrl2));
+  subframe_tester->SimulateNavigationCommit(GURL(kDefaultTestUrl2));
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      subframe);
+  subframe_tester->SimulateNavigationStop();
+
+  // Navigate again to see if the timing updated for a subframe message.
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  AssertNoHistogramsLogged();
+}
+
+TEST_F(MetricsWebContentsObserverTest, SamePageNoTrigger) {
+  base::TimeDelta first_layout = base::TimeDelta::FromMilliseconds(1);
+
+  PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_layout = first_layout;
+
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      web_contents()->GetMainFrame());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrlAnchor));
+  // A same page navigation shouldn't trigger logging UMA for the original.
+  AssertNoHistogramsLogged();
+}
+
+TEST_F(MetricsWebContentsObserverTest, SamePageNoTriggerUntilTrueNavCommit) {
+  base::TimeDelta first_layout = base::TimeDelta::FromMilliseconds(1);
+
+  PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_layout = first_layout;
+
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      web_contents()->GetMainFrame());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrlAnchor));
+  // A same page navigation shouldn't trigger logging UMA for the original.
+  AssertNoHistogramsLogged();
+
+  // But we should keep the timing info and log it when we get another
+  // navigation.
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl2));
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 1);
+  histogram_tester_.ExpectBucketCount(kHistogramNameFirstLayout,
+                                      first_layout.InMilliseconds(), 1);
+}
+
+TEST_F(MetricsWebContentsObserverTest, SingleMetricAfterCommit) {
+  base::TimeDelta first_layout = base::TimeDelta::FromMilliseconds(1);
+
+  PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_layout = first_layout;
+
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      web_contents()->GetMainFrame());
+
+  AssertNoHistogramsLogged();
+
+  // Navigate again to force histogram recording.
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl2));
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 1);
+  histogram_tester_.ExpectBucketCount(kHistogramNameFirstLayout,
+                                      first_layout.InMilliseconds(), 1);
+}
+
+TEST_F(MetricsWebContentsObserverTest, MultipleMetricsAfterCommits) {
+  base::TimeDelta first_layout_1 = base::TimeDelta::FromMilliseconds(1);
+  base::TimeDelta first_layout_2 = base::TimeDelta::FromMilliseconds(20);
+  base::TimeDelta response = base::TimeDelta::FromMilliseconds(10);
+  base::TimeDelta dom_content = base::TimeDelta::FromMilliseconds(40);
+  base::TimeDelta load = base::TimeDelta::FromMilliseconds(100);
+
+  PageLoadTiming timing;
+  timing.navigation_start = base::Time::FromDoubleT(1);
+  timing.first_layout = first_layout_1;
+  timing.response_start = response;
+  timing.dom_content_loaded_event_start = dom_content;
+  timing.load_event_start = load;
+
+  content::WebContentsTester* web_contents_tester =
+      content::WebContentsTester::For(web_contents());
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing),
+      web_contents()->GetMainFrame());
+
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl2));
+
+  PageLoadTiming timing2;
+  timing2.navigation_start = base::Time::FromDoubleT(200);
+  timing2.first_layout = first_layout_2;
+
+  observer_->OnMessageReceived(
+      PageLoadMetricsMsg_TimingUpdated(observer_->routing_id(), timing2),
+      web_contents()->GetMainFrame());
+
+  web_contents_tester->NavigateAndCommit(GURL(kDefaultTestUrl));
+
+  histogram_tester_.ExpectBucketCount(kHistogramNameFirstLayout,
+                                      first_layout_1.InMilliseconds(), 1);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 2);
+  histogram_tester_.ExpectBucketCount(kHistogramNameFirstLayout,
+                                      first_layout_1.InMilliseconds(), 1);
+  histogram_tester_.ExpectBucketCount(kHistogramNameFirstLayout,
+                                      first_layout_2.InMilliseconds(), 1);
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 1);
+  histogram_tester_.ExpectBucketCount(kHistogramNameDomContent,
+                                      dom_content.InMilliseconds(), 1);
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 1);
+  histogram_tester_.ExpectBucketCount(kHistogramNameLoad, load.InMilliseconds(),
+                                      1);
+}
+
+}  // namespace page_load_metrics