Report frequency of single page app navigations to UMA

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

Index: third_party/WebKit/Source/web/tests/WebFrameTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
index 075bd61acf7c77cbfc5366e835515ee98c49d3f4..af8c1e856e3b267ea352ee99f2467ba62859eb81 100644
--- a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
@@ -103,6 +103,7 @@
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/scroll/ScrollbarThemeMock.h"
 #include "platform/scroll/ScrollbarThemeOverlayMock.h"
+#include "platform/testing/HistogramTester.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 #include "platform/testing/URLTestHelpers.h"
 #include "platform/testing/UnitTestHelpers.h"
@@ -12188,4 +12189,36 @@ TEST_F(WebFrameTest, AltTextOnAboutBlankPage) {
   EXPECT_EQ("foo alt", text.Utf8());
 }
 
+TEST_F(WebFrameTest, RecordSameDocumentNavigationToHistogram) {
+  const char* histogramName =
+      "RendererScheduler.UpdateForSameDocumentNavigationCount";
+  FrameTestHelpers::WebViewHelper web_view_helper;
+  HistogramTester tester;
+  web_view_helper.InitializeAndLoad("about:blank");
+  LocalFrame* frame =
+      ToLocalFrame(web_view_helper.WebView()->GetPage()->MainFrame());
+
+  FrameLoader& main_frame_loader =
+      web_view_helper.WebView()->MainFrameImpl()->GetFrame()->Loader();
+  RefPtr<SerializedScriptValue> message =
+      SerializeString("message", ToScriptStateForMainWorld(frame));
+  tester.ExpectTotalCount(histogramName, 0);
+  main_frame_loader.UpdateForSameDocumentNavigation(
+      ToKURL("about:blank"), kSameDocumentNavigationHistoryApi, message,
+      kScrollRestorationAuto, kFrameLoadTypeInitialHistoryLoad,
+      frame->GetDocument());
+  tester.ExpectBucketCount(histogramName, 0, 1);
+  main_frame_loader.UpdateForSameDocumentNavigation(
+      ToKURL("about:blank"), kSameDocumentNavigationDefault, message,
+      kScrollRestorationManual, kFrameLoadTypeBackForward,
+      frame->GetDocument());
+  tester.ExpectBucketCount(histogramName, 1, 1);
+  main_frame_loader.UpdateForSameDocumentNavigation(
+      ToKURL("about:blank"), kSameDocumentNavigationDefault, message,
+      kScrollRestorationManual, kFrameLoadTypeInitialHistoryLoad,
+      frame->GetDocument());
+  tester.ExpectTotalCount(histogramName, 3);
+  tester.ExpectBucketCount(histogramName, 2, 1);
+}
+
 }  // namespace blink