Add histograms for data usage

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 49aa452bbb54c688253b4ddd0676e913634e60bf..b6a39fcb7fdde063ba8a9f4d15344362d39913b4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -6566,6 +6566,41 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DataUsage.MatchingRulesCount" units="count">
+  <owner>bengr@chromium.org</owner>
+  <owner>rajendrant@chromium.org</owner>
+  <summary>
+    The number of matching rules fetched from the platform external data use
+    observer.
+  </summary>
+</histogram>
+
+<histogram name="DataUsage.Perf.MatchingRuleFetchDuration" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>rajendrant@chromium.org</owner>
+  <summary>
+    The time taken to fetch the matching rules from the platform external data
+    use observer. This will be the duration from the time fetch was called to
+    the time the rules are returned asynchronously.
+  </summary>
+</histogram>
+
+<histogram name="DataUsage.Perf.ReportSubmissionDuration" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>rajendrant@chromium.org</owner>
+  <summary>
+    The time taken to submit the data use reports to the platform external data
+    use observer. This will be the duration from the time reports are submitted
+    to the time report submitted asynchronous callback was received.
+  </summary>
+</histogram>
+
+<histogram name="DataUsage.Perf.URLRegexMatchDuration" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>rajendrant@chromium.org</owner>
+  <summary>The time taken for a regular expression to process an URL</summary>
+</histogram>
+
 <histogram name="DataUsage.ReportSubmission.Bytes" units="bytes">
   <owner>bengr@chromium.org</owner>
   <owner>tbansal@chromium.org</owner>