Add metrics to keep track of the tab activate/deactivate cycle

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 4fd1a7941c3d029237eacdd0f14768df4234c2a4..42bcee2f10e0e50769e27556c102b5f5edd24518 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -61828,6 +61828,30 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Tab.Deactivation.Bookmarked" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was deactivated. Closing tabs are not included. This histogram also
+    records if the tab's URL was bookmarked.
+  </summary>
+</histogram>
+
+<histogram name="Tab.Deactivation.HadFormInteraction" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was deactivated. Closing tabs are not included. This histogram also
+    records if the tab had any form interaction.
+  </summary>
+</histogram>
+
+<histogram name="Tab.Deactivation.Pinned" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was deactivated. Closing tabs are not included. This histogram also
+    records if the tab was pinned to the tab strip or not.
+  </summary>
+</histogram>
+
 <histogram name="Tab.Discarding" enum="TabDiscardingEvents">
   <obsolete>
     Deprecated 10/2015, not needed anymore.
@@ -61929,6 +61953,30 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Tab.Reactivation.Bookmarked" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was reactivated after being hidden. This histogram also records if the
+    tab's URL was bookmarked.
+  </summary>
+</histogram>
+
+<histogram name="Tab.Reactivation.HadFormInteraction" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was reactivated after being hidden. This histogram also records if the
+    tab had any form interaction.
+  </summary>
+</histogram>
+
+<histogram name="Tab.Reactivation.Pinned" enum="Boolean">
+  <owner>pmonette@chromium.org</owner>
+  <summary>
+    A tab was reactivated after being hidden. This histogram also records if the
+    tab was pinned to the tab strip.
+  </summary>
+</histogram>
+
 <histogram name="Tab.RendererCrashStatus" enum="TabRendererCrashStatus">
   <owner>jaekyun@chromium.org</owner>
   <summary>