M57: service worker: Add UMA for navigation preload response timing.

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 e67d2c6acab8faace3bb8cac0b223048c91c6ff8..348ac5edb1262e00edb3076a711c9de07b47b135 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -60362,6 +60362,35 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="ServiceWorker.NavigationPreload.ConcurrentTime" units="ms">
+  <owner>falken@chromium.org</owner>
+  <summary>
+    The duration of time when both (1) a service worker is being found and
+    possibly started up, (2) the navigation preload request is in-flight. The
+    measurement ends once either the worker is prepared, or the navigation
+    preload response is received (OnReceiveResponse() is called). This is a
+    rough estimate of the performance win of using navigation preload, ignoring
+    concurrency overhead. This histogram is recorded when a navigation preload
+    response is succesfully forwarded to the service worker's fetch event, with
+    the same restrictions as for
+    ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time. The sample is
+    additionally recorded to the appropriate suffixed histograms.
+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.NavigationPreload.FinishedBeforeStartWorker"
+    enum="BooleanNavPreloadFinishedFirst">
+  <owner>falken@chromium.org</owner>
+  <summary>
+    Whether the navigation preload response arrived before the activated and
+    running service worker was prepared. This histogram is recorded when a
+    navigation preload response is succesfully forwarded to the service worker's
+    fetch event, with the same restrictions as for
+    ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time. The sample is
+    additionally recorded to the appropriate suffixed histograms.
+  </summary>
+</histogram>
+
 <histogram name="ServiceWorker.NavigationPreload.HeaderSize" units="bytes">
   <owner>horo@chromium.org</owner>
   <summary>
@@ -60371,6 +60400,51 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="ServiceWorker.NavigationPreload.NavPreloadAfterSWStart"
+    units="ms">
+  <owner>falken@chromium.org</owner>
+  <summary>
+    This is recorded in the case where the activated and running service worker
+    was prepared before the navigation preload response arrived. It is the
+    remaining time it took to receive the response after the worker was
+    prepared.
+
+    This histogram is recorded when a navigation preload response is succesfully
+    forwarded to the service worker's fetch event (for the case mentioned
+    above), with the same restrictions as for
+    ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time. The sample is
+    additionally recorded to the appropriate suffixed histograms.
+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.NavigationPreload.ResponseTime" units="ms">
+  <owner>falken@chromium.org</owner>
+  <summary>
+    The time taken for the navigation preload response to start, i.e., when
+    OnReceiveResponse() is called. This histogram is recorded when a navigation
+    preload response is successfully forwarded to the service worker's fetch
+    event, with the same restrictions as for
+    ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time. The sample is
+    additionally recorded to the appropriate suffixed histograms.
+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.NavigationPreload.SWStartAfterNavPreload"
+    units="ms">
+  <owner>falken@chromium.org</owner>
+  <summary>
+    This is recorded in the case where the navigation preload response arrived
+    before the activated and running service worker was prepared. It is the
+    remaining time it took to prepare the worker after the response arrived.
+
+    This histogram is recorded when a navigation preload response is succesfully
+    forwarded to the service worker's fetch event (for the case mentioned
+    above), with the same restrictions as for
+    ServiceWorker.ActivatedWorkerPreparationForMainFrame.Time. The sample is
+    additionally recorded to the appropriate suffixed histograms.
+  </summary>
+</histogram>
+
 <histogram name="ServiceWorker.NotificationClickEvent.Time" units="ms">
   <owner>peter@chromium.org</owner>
   <summary>
@@ -79352,6 +79426,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Missing data in disk cache"/>
 </enum>
 
+<enum name="BooleanNavPreloadFinishedFirst" type="int">
+  <int value="0" label="Worker preparation finished first"/>
+  <int value="1" label="Navigation preload response arrived first"/>
+</enum>
+
 <enum name="BooleanNeedsClearing" type="int">
   <int value="0" label="Doesn't need clearing"/>
   <int value="1" label="Needs to be clearred"/>
@@ -113214,6 +113293,16 @@ value.
       name="ServiceWorker.ActivatedWorkerPreparationForMainFrame.Type"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="NavigationPreloadOrWorkerFirst">
+  <suffix name="SWStartFirst"
+      label="The service worker finished preparing before the navigation
+             preload response arrived."/>
+  <suffix name="NavPreloadFirst"
+      label="The navigation preload response arrived before the service
+             worker finished preparing."/>
+  <affected-histogram name="ServiceWorker.NavigationPreload.ConcurrentTime"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="Net.BidirectionalStreamExperiment" separator=".">
   <owner>xunjieli@chromium.org</owner>
   <suffix name="QUIC" label="Bidirectional streams that use QUIC protocol"/>
@@ -117557,6 +117646,22 @@ value.
   <affected-histogram name="StartupTimeBomb.Alarm"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="StartWorkerExistingProcess">
+  <suffix name="StartWorkerExistingProcess"
+      label="The worker started up in an existing process"/>
+  <affected-histogram name="ServiceWorker.NavigationPreload.ConcurrentTime"/>
+  <affected-histogram
+      name="ServiceWorker.NavigationPreload.ConcurrentTime_NavPreloadFirst"/>
+  <affected-histogram
+      name="ServiceWorker.NavigationPreload.ConcurrentTime_SWStartFirst"/>
+  <affected-histogram
+      name="ServiceWorker.NavigationPreload.FinishedBeforeStartWorker"/>
+  <affected-histogram
+      name="ServiceWorker.NavigationPreload.NavPreloadAfterSWStart"/>
+  <affected-histogram
+      name="ServiceWorker.NavigationPreload.SWStartAfterNavPreload"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="Storage.BlobAppendableItems" separator=".">
   <suffix name="Bytes" label="Appending bytes."/>
   <suffix name="File" label="Appending a file with a known size."/>