From 2a9de01584bbec90806d0a5da4eb23c7c513fe60 Mon Sep 17 00:00:00 2001
From: Drew Thomas <async@google.com>
Date: Mon, 25 Mar 2024 14:42:31 -0700
Subject: [PATCH] Add histogram metadata.

Change-Id: If52f76b3a9ffcd2e9e86244e22d3c1282989adc1
---
 .../histograms/metadata/cobalt/histograms.xml | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/tools/metrics/histograms/metadata/cobalt/histograms.xml b/tools/metrics/histograms/metadata/cobalt/histograms.xml
index 13f4d9d71a57..f438809dd7eb 100644
--- a/tools/metrics/histograms/metadata/cobalt/histograms.xml
+++ b/tools/metrics/histograms/metadata/cobalt/histograms.xml
@@ -185,6 +185,72 @@ Always run the pretty print utility on this file after editing:
   </summary>
 </histogram>
 
+<histogram name="Cobalt.Media.XHR.RequestTiming.TcpHandshakeTime"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for the TCP handshake of XHR requests.
+  </summary>
+</histogram>
+
+<histogram name="Cobalt.Media.XHR.RequestTiming.DnsLookupTime"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for the DNS lookup of XHR requests.
+  </summary>
+</histogram>
+
+<histogram name="Cobalt.Media.XHR.RequestTiming.RequestTime"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for the request of XHR requests.
+  </summary>
+</histogram>
+
+<histogram name="Cobalt.Media.XHR.RequestTiming.TlsNegotiationTime"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for TLS negotiation of XHR requests.
+  </summary>
+</histogram>
+
+<histogram name="Cobalt.Media.XHR.RequestTiming.TimeToFetch"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for the full fetch of XHR requests.
+  </summary>
+</histogram>
+
+<histogram name="Cobalt.Media.XHR.RequestTiming.ServiceWorkerProcessingTime"
+    units="milliseconds" expires_after="never">
+<!-- expires-never: Needed for long-term tracking of SourceBuffer latency. -->
+
+  <owner>async@google.com</owner>
+  <owner>cobalt-team@google.com</owner>
+  <summary>
+    Timing data for the service worker processing time of XHR requests.
+  </summary>
+</histogram>
+
 <histogram name="Cobalt.MediaDevices.MicCreationSucceeded" enum="Boolean"
     expires_after="never">
 <!-- expires-never: Needed for long-term tracking of device mic support. -->