MediaPerceptionPrivate IDL and skeleton.

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 2a06a8bbb27d9ff7344cac5afe20ece98b3ef4a5..676621d04d3ee6cdf4cda89ee1ea94d60f62de8c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -94084,6 +94084,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="405" label="FILE_MANAGER_PRIVATE_ON_APPS_UPDATED"/>
   <int value="406" label="ACCESSIBILITY_PRIVATE_ON_TWO_FINGER_TOUCH_START"/>
   <int value="407" label="ACCESSIBILITY_PRIVATE_ON_TWO_FINGER_TOUCH_STOP"/>
+  <int value="408" label="MEDIA_PERCEPTION_PRIVATE_ON_MEDIA_PERCEPTION"/>
 </enum>
 
 <enum name="ExtensionFileWriteResult" type="int">
@@ -95306,6 +95307,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1170" label="WEBRTC_AUDIO_PRIVATE_SET_AUDIO_EXPERIMENTS"/>
   <int value="1171" label="AUTOTESTPRIVATE_GETPLAYSTORESTATE"/>
   <int value="1172" label="AUTOTESTPRIVATE_SETPLAYSTOREENABLED"/>
+  <int value="1173" label="MEDIAPERCEPTIONPRIVATE_GETSTATE"/>
+  <int value="1174" label="MEDIAPERCEPTIONPRIVATE_SETSTATE"/>
+  <int value="1175" label="MEDIAPERCEPTIONPRIVATE_GETDIAGNOSTICS"/>
 </enum>
 
 <enum name="ExtensionIconState" type="int">
@@ -95732,6 +95736,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="201" label="kNetworkingOnc"/>
   <int value="202" label="kVirtualKeyboard"/>
   <int value="203" label="kNetworkingCastPrivate"/>
+  <int value="204" label="kMediaPerceptionPrivate"/>
 </enum>
 
 <enum name="ExtensionServiceVerifyAllSuccess" type="int">