Add use counter for chrome.loadTimes

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 7b4de2348950edba7d73470da6f1047c18a2ed20..93dfb85ba0be726247839b8b1ab1935c0f701cd0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -77967,6 +77967,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1483" label="StarInTimingAllowOrigin"/>
   <int value="1484" label="SVGSMILAdditiveAnimation"/>
   <int value="1485" label="SendBeaconWithNonSimpleContentType"/>
+  <int value="1486" label="ChromeLoadtimesRequestTime"/>
+  <int value="1487" label="ChromeLoadtimesStartLoadTime"/>
+  <int value="1488" label="ChromeLoadtimesCommitLoadTime"/>
+  <int value="1489" label="ChromeLoadtimesFinishDocumentLoadTime"/>
+  <int value="1490" label="ChromeLoadtimesFinishLoadTime"/>
+  <int value="1491" label="ChromeLoadtimesFirstPaintTime"/>
+  <int value="1492" label="ChromeLoadtimesFirstPaintAfterLoadTime"/>
+  <int value="1493" label="ChromeLoadtimesNavigationType"/>
+  <int value="1494" label="ChromeLoadtimesWasFetchedViaSpdy"/>
+  <int value="1495" label="ChromeLoadtimesWasNpnNegotiated"/>
+  <int value="1496" label="ChromeLoadtimesNpnNegotiatedProtocol"/>
+  <int value="1497" label="ChromeLoadtimesWasAlternateProtocolAvailable"/>
+  <int value="1498" label="ChromeLoadtimesConnectionInfo"/>
 </enum>
 
 <enum name="FetchRequestMode" type="int">