Media: add metrics for orientation lock when video goes fullscreen.

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 543fa7e2cc5986675dd7fe8705bbb80713bfbfd2..c09f880650bf4acf8e55fd32a0b133e9ec5a299b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25579,6 +25579,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.Video.FullscreenOrientationLock.LockResult"
+    enum="VideoFullscreenOrientationLockResult">
+  <owner>mlamouri@chromium.org</owner>
+  <summary>
+    Result of the orientation lock attempt when a video enters fullscreen.
+  </summary>
+</histogram>
+
+<histogram name="Media.Video.FullscreenOrientationLock.MetadataAvailability"
+    enum="VideoFullscreenOrientationLockMetadataAvailability">
+  <owner>mlamouri@chromium.org</owner>
+  <summary>
+    Status of the metadata when attempting to lock the screen orientation for a
+    fullscreen video.
+  </summary>
+</histogram>
+
 <histogram name="Media.Video.KeyFrameDistance" units="ms">
   <owner>avayvod@chromium.org</owner>
   <owner>dalecurtis@chromium.org</owner>
@@ -106050,6 +106067,18 @@ value.
   <int value="9" label="UYVY"/>
 </enum>
 
+<enum name="VideoFullscreenOrientationLockMetadataAvailability" type="int">
+  <int value="0" label="Available"/>
+  <int value="1" label="Missing"/>
+  <int value="2" label="Received (after Missing)"/>
+</enum>
+
+<enum name="VideoFullscreenOrientationLockResult" type="int">
+  <int value="0" label="Already locked, no attempt"/>
+  <int value="1" label="Portrait"/>
+  <int value="2" label="Landscape"/>
+</enum>
+
 <enum name="VideoPixelFormat" type="int">
   <obsolete>
     Deprecated as of 05/2015. Substituted by VideoFormat.