Added some browsertests to PageLoadMetrics change

chrome/browser/page_load_metrics/page_load_metrics_browsertest.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 "base/test/histogram_tester.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "net/test/spawned_test_server/spawned_test_server.h"
+
+namespace page_load_metrics {
+
+class MetricsWebContentsObserverBrowserTest : public InProcessBrowserTest {
+ public:

[jochen (gone - plz use gerrit), 2015/09/30 09:44:24]

plz add a ctor and dtor

+  const char* kHistogramNameFirstLayout =
+      "PageLoad.Timing.NavigationToFirstLayout";
+  const char* kHistogramNameDomContent =
+      "PageLoad.Timing.NavigationToDOMContentLoadedEventFired";
+  const char* kHistogramNameLoad = "PageLoad.Timing.NavigationToLoadEventFired";
+
+ protected:
+  base::HistogramTester histogram_tester_;
+};

[jochen (gone - plz use gerrit), 2015/09/30 09:44:24]

disallow copy/assign

+
+IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, NoNavigation) {
+  ASSERT_TRUE(test_server()->Start());
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 0);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 0);
+}
+
+IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, NewPage) {
+  ASSERT_TRUE(test_server()->Start());
+
+  ui_test_utils::NavigateToURL(browser(),
+                               test_server()->GetURL("/title1.html"));
+  ui_test_utils::NavigateToURL(browser(),
+                               test_server()->GetURL("/title2.html"));
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 1);
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 1);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 1);
+}
+
+IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, AnchorLink) {
+  ASSERT_TRUE(test_server()->Start());
+
+  ui_test_utils::NavigateToURL(browser(),
+                               test_server()->GetURL("/title1.html"));
+  ui_test_utils::NavigateToURL(browser(),
+                               test_server()->GetURL("/title1.html#hash"));
+  ui_test_utils::NavigateToURL(browser(),
+                               test_server()->GetURL("/title2.html"));
+
+  histogram_tester_.ExpectTotalCount(kHistogramNameDomContent, 1);
+  histogram_tester_.ExpectTotalCount(kHistogramNameLoad, 1);
+  histogram_tester_.ExpectTotalCount(kHistogramNameFirstLayout, 1);
+}
+
+}  // namespace page_load_metrics