[Tab Metrics] Measure FP, FCP and FMP for Foreground Tab during Session Restore

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 306495853b65b312df82c35bd22c78caa71dd209..b21bb6d5bfb5647a13666722f6b4ee6e0e1d6dc6 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -76632,6 +76632,39 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram
+    name="TabManager.Experimental.SessionRestore.ForegroundTab.FirstContentfulPaint"
+    units="ms">
+  <owner>fmeawad@chromium.org</owner>
+  <owner>ducbui@google.com</owner>
+  <summary>
+    Elapsed time between the start of the loading and the first contentful paint
+    of a foreground tab during session restore.
+  </summary>
+</histogram>
+
+<histogram
+    name="TabManager.Experimental.SessionRestore.ForegroundTab.FirstMeaningfulPaint"
+    units="ms">
+  <owner>fmeawad@chromium.org</owner>
+  <owner>ducbui@google.com</owner>
+  <summary>
+    Elapsed time between the start of the loading and the first meaningful paint
+    of a foreground tab during session restore.
+  </summary>
+</histogram>
+
+<histogram
+    name="TabManager.Experimental.SessionRestore.ForegroundTab.FirstPaint"
+    units="ms">
+  <owner>fmeawad@chromium.org</owner>
+  <owner>ducbui@google.com</owner>
+  <summary>
+    Elapsed time between the start of the loading and the first paint of a
+    foreground tab during session restore.
+  </summary>
+</histogram>
+
 <histogram name="Tabs.CountAtResume" units="tabs">
   <owner>lliabraa@chromium.org</owner>
   <summary>