Introduce Dolby Vision video codec and Demuxer support

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 25b765f22d5877a97f2b5dbcfd5a2376e66f71d8..d4906b2e2b3a7db234cc8a3861bcbad96800b733 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -97375,6 +97375,7 @@ value.
   <int value="9" label="OPUS"/>
   <int value="10" label="HEVC"/>
   <int value="11" label="AC3"/>
+  <int value="12" label="DOLBYVISION"/>
 </enum>
 
 <enum name="MultiAccountUpdateBubbleUserAction" type="int">
@@ -108188,6 +108189,7 @@ value.
   <int value="6" label="kCodecVP8"/>
   <int value="7" label="kCodecVP9"/>
   <int value="8" label="kCodecHEVC"/>
+  <int value="9" label="kCodecDolbyVision"/>
 </enum>
 
 <enum name="VideoCodecProfile" type="int">
@@ -108210,6 +108212,10 @@ value.
   <int value="16" label="HEVC Main"/>
   <int value="17" label="HEVC Main10"/>
   <int value="18" label="HEVC Main Still-picture"/>
+  <int value="19" label="DolbyVision profile0"/>
+  <int value="20" label="DolbyVision profile4"/>
+  <int value="21" label="DolbyVision profile5"/>
+  <int value="22" label="DolbyVision profile7"/>
 </enum>
 
 <enum name="VideoDecodeAcceleratorError" type="int">