Add use counter for getDisplayMedia

Bug: 326740
Change-Id: Iea381d99984249796fb0e11279174a553ea9ce8a
Reviewed-on: https://chromium-review.googlesource.com/c/1313328Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605602}

third_party/blink/public/platform/web_feature.mojom

@@ -2068,6 +2068,7 @@ enum WebFeature {
   kDynamicImportModuleScript = 2616,
   kHistoryPushState = 2617,
   kHistoryReplaceState = 2618,
+  kGetDisplayMedia = 2619,
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.
   // Also, run update_use_counter_feature_enum.py in

third_party/blink/renderer/modules/mediastream/media_devices.idl

@@ -20,7 +20,8 @@
     ] Promise<MediaStream>
     getUserMedia(optional MediaStreamConstraints constraints);
     [
-      RuntimeEnabled = GetDisplayMedia, CallWith = ScriptState, RaisesException
+      RuntimeEnabled = GetDisplayMedia, CallWith = ScriptState, RaisesException,
+      MeasureAs = GetDisplayMedia
     ] Promise<MediaStream>
     getDisplayMedia(optional MediaStreamConstraints constraints);
 };

tools/metrics/histograms/enums.xml

@@ -20654,6 +20654,7 @@ Called by update_net_error_codes.py.-->
   <int value="2616" label="DynamicImportModuleScript"/>
   <int value="2617" label="HistoryPushState"/>
   <int value="2618" label="HistoryReplaceState"/>
+  <int value="2619" label="GetDisplayMedia"/>
 </enum>
 
 <enum name="FeaturePolicyFeature">