Add more metrics for VideoPersistence.

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 e0047bb6746b465a7317095829368ca3f4387d66..b94d08937c49f36cbd8bcd4923bc897e92587dee 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27776,6 +27776,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Pixel format used in HTML5 video. Emitted on video load.</summary>
 </histogram>
 
+<histogram name="Media.VideoPersistence.AttemptResult"
+    enum="VideoPersistenceAttemptResult">
+  <owner>mlamouri@chromium.org</owner>
+  <owner>peconn@chromium.org</owner>
+  <owner>zqzhang@chromium.org</owner>
+  <summary>
+    Every time a video persistence session could be triggered, it records the
+    result of the attempt.
+  </summary>
+</histogram>
+
 <histogram name="Media.VideoPersistence.ControlsType"
     enum="VideoPersistenceControlsType">
   <owner>mlamouri@chromium.org</owner>
@@ -27786,6 +27797,26 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.VideoPersistence.Duration" units="ms">
+  <owner>mlamouri@chromium.org</owner>
+  <owner>peconn@chromium.org</owner>
+  <owner>zqzhang@chromium.org</owner>
+  <summary>
+    Records the length during which a video was in a persistent state. It is
+    recorded once per video persistence session.
+  </summary>
+</histogram>
+
+<histogram name="Media.VideoPersistence.EndReason"
+    enum="VideoPersistenceEndReason">
+  <owner>mlamouri@chromium.org</owner>
+  <owner>peconn@chromium.org</owner>
+  <owner>zqzhang@chromium.org</owner>
+  <summary>
+    Records the reason why a video persistence session has ended.
+  </summary>
+</histogram>
+
 <histogram name="Media.VideoPixelFormat" enum="VideoPixelFormat">
   <obsolete>
     Replaced by Media.VideoFormat 05/2015.
@@ -113410,11 +113441,32 @@ from previous Chrome versions.
   <int value="2" label="Landscape"/>
 </enum>
 
+<enum name="VideoPersistenceAttemptResult" type="int">
+  <int value="0" label="Success"/>
+  <int value="1" label="No system support"/>
+  <int value="2" label="No feature"/>
+  <int value="3" label="No activity support"/>
+  <int value="4" label="Already running"/>
+  <int value="5" label="Restarting"/>
+  <int value="6" label="Finishing"/>
+  <int value="7" label="No WebContents"/>
+  <int value="8" label="No video"/>
+</enum>
+
 <enum name="VideoPersistenceControlsType" type="int">
   <int value="0" label="Native controls"/>
   <int value="1" label="Custom controls"/>
 </enum>
 
+<enum name="VideoPersistenceEndReason" type="int">
+  <int value="0" label="Resume"/>
+  <int value="1" label="Navigation"/>
+  <int value="2" label="Close"/>
+  <int value="3" label="Crash"/>
+  <int value="4" label="New tab"/>
+  <int value="5" label="Reparent"/>
+</enum>
+
 <enum name="VideoPixelFormat" type="int">
   <obsolete>
     Deprecated as of 05/2015. Substituted by VideoFormat.