Add a histogram for Blink decoded image orientation

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 359e403d943161dbb1dabc1b116c7b324fa6cb15..ea3bd249f711990c1ca68457dcf2b97e7dc2f19c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -2848,6 +2848,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Image codec inferred during decode.</summary>
 </histogram>
 
+<histogram name="Blink.DecodedImageOrientation" enum="DecodedImageOrientation">
+  <owner>rob.buis@samsung.org</owner>
+  <summary>Image orientation inferred during decode.</summary>
+</histogram>
+
 <histogram name="Blink.MediaElement.Autoplay" enum="MediaElementAutoPlay">
   <owner>oysteine@chromium.org</owner>
   <summary>
@@ -56287,6 +56292,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="6" label="kImageBMP"/>
 </enum>
 
+<enum name="DecodedImageOrientation" type="int">
+  <int value="0" label="kImageOrientationUnknown"/>
+  <int value="1" label="kImageOrientationTopLeft"/>
+  <int value="2" label="kImageOrientationTopRight"/>
+  <int value="3" label="kImageOrientationBottomRight"/>
+  <int value="4" label="kImageOrientationBottomLeft"/>
+  <int value="5" label="kImageOrientationLeftTop"/>
+  <int value="6" label="kImageOrientationRightTop"/>
+  <int value="7" label="kImageOrientationRightBottom"/>
+  <int value="8" label="kImageOrientationLeftBottom"/>
+</enum>
+
 <enum name="DefaultBrowserAsyncAttemptResult" type="int">
   <int value="0" label="Success">No errors encountered.</int>
   <int value="1" label="Already default">