Detect HDR capability

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 f3310ae980f2d4175e6d6fbb70a9ef1a33b0d6ab..5377a502ae6e37cdc8c8a9172e8aaf7e090b7a5d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -23445,6 +23445,33 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GPU.Output.ColorSpace" enum="DXGI_COLOR_SPACE_TYPE">
+  <owner>hubbe@chromium.org</owner>
+  <owner>media-dev@chromium.org</owner>
+  <summary>
+    Records if the output color space of the monitor as reported by DXGI.
+    Recorded when the gpu process starts.
+  </summary>
+</histogram>
+
+<histogram name="GPU.Output.HDR" enum="Boolean">
+  <owner>hubbe@chromium.org</owner>
+  <owner>media-dev@chromium.org</owner>
+  <summary>
+    Records if the output monitor is HDR capable. Recorded when the gpu process
+    starts.
+  </summary>
+</histogram>
+
+<histogram name="GPU.Output.MaxLuminance" units="lumens">
+  <owner>hubbe@chromium.org</owner>
+  <owner>media-dev@chromium.org</owner>
+  <summary>
+    Records if the display maximum lumens as reported by windows.
+    Recorded when the gpu process starts.
+  </summary>
+</histogram>
+
 <histogram name="GPU.ProgramCache.BinaryCacheHitTime" units="microseconds">
   <owner>vmiura@chromium.org</owner>
   <summary>The time to load a gpu program from the program cache.</summary>