Associate a main resource request with its PageLoadTracker.

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc b/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
index 76124a26369d7e0452976fcfa4ff0411d42bb71d..1586b63a606c39ae50adb03ec02ac6281b8809c2 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
@@ -49,6 +49,7 @@ class PageLoadMetricsBrowserTest : public InProcessBrowserTest {
 
   base::HistogramTester histogram_tester_;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsBrowserTest);
 };
 
@@ -85,6 +86,7 @@ IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest, NewPage) {
       internal::kHistogramParseBlockedOnScriptLoad, 1);
   histogram_tester_.ExpectTotalCount(
       internal::kHistogramParseBlockedOnScriptExecution, 1);
+  histogram_tester_.ExpectTotalCount(internal::kHistogramTotalBytes, 1);
 
   // Verify that NoPageLoadMetricsRecorded returns false when PageLoad metrics
   // have been recorded.
@@ -549,3 +551,17 @@ IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest, CSSTiming) {
   histogram_tester_.ExpectTotalCount(
       "PageLoad.CSSTiming.ParseAndUpdate.BeforeFirstContentfulPaint", 1);
 }
+
+IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest, PayloadSize) {
+  ASSERT_TRUE(embedded_test_server()->Start());
+
+  ui_test_utils::NavigateToURL(browser(), embedded_test_server()->GetURL(
+                                              "/page_load_metrics/large.html"));
+  NavigateToUntrackedUrl();
+
+  histogram_tester_.ExpectTotalCount(internal::kHistogramTotalBytes, 1);
+
+  // Verify that there is a single sample recorded in the 10kB bucket (the size
+  // of the main HTML response).
+  histogram_tester_.ExpectBucketCount(internal::kHistogramTotalBytes, 10, 1);
+}