WebCodecs: Add measure IDL attributes

Measure interface usage by constructor calls.

Bug: 1121462
Change-Id: Ibdac55925d918bf86ec5f01b7046b8c54b4671ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2374506
Commit-Queue: Steven Holte <holte@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Auto-Submit: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801854}

third_party/blink/public/mojom/web_feature/web_feature.mojom

@@ -2781,6 +2781,11 @@ enum WebFeature {
   kRTCPeerConnectionCreateOffer = 3453,
   kRTCPeerConnectionCreateAnswer = 3454,
   kV8AuthenticatorAttestationResponse_GetTransports_Method = 3455,
+  kWebCodecsAudioDecoder = 3456,
+  kWebCodecsVideoDecoder = 3457,
+  kWebCodecsVideoEncoder = 3458,
+  kWebCodecsVideoTrackReader= 3459,
+  kWebCodecsImageDecoder = 3460,
 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.

third_party/blink/renderer/modules/webcodecs/audio_decoder.idl

@@ -13,7 +13,7 @@
   // construct a new decoder to recover.
   //
   // TODO(sandersd): Consider adding a state or last error attribute.
-  [CallWith=ScriptState, RaisesException] constructor(AudioDecoderInit init);
+  [CallWith=ScriptState, RaisesException, MeasureAs=WebCodecsAudioDecoder] constructor(AudioDecoderInit init);
 
   // The number of pending decode requests. This does not include requests that
   // have been sent to the underlying codec.

third_party/blink/renderer/modules/webcodecs/image_decoder.idl

@@ -10,7 +10,7 @@
     RuntimeEnabled=WebCodecs,
     ImplementedAs=ImageDecoderExternal
 ] interface ImageDecoder {
-  [CallWith=ScriptState, RaisesException] constructor(ImageDecoderInit init);
+  [CallWith=ScriptState, RaisesException, MeasureAs=WebCodecsImageDecoder] constructor(ImageDecoderInit init);
 
   // Returns true if ImageDecoder supports decoding of the given mime type.
   static boolean canDecodeType(USVString type);

third_party/blink/renderer/modules/webcodecs/video_decoder.idl

@@ -21,7 +21,7 @@
   // When in an closed state, all methods will fail.
   //
   // TODO(sandersd): Consider adding a state or last error attribute.
-  [CallWith=ScriptState, RaisesException] constructor(VideoDecoderInit init);
+  [CallWith=ScriptState, RaisesException, MeasureAs=WebCodecsVideoDecoder] constructor(VideoDecoderInit init);
 
   // The number of pending decode requests. This does not include requests that
   // have been sent to the underlying codec.

third_party/blink/renderer/modules/webcodecs/video_encoder.idl

@@ -8,7 +8,7 @@
     Exposed=Window,
     RuntimeEnabled=WebCodecs
 ] interface VideoEncoder {
-    [CallWith=ScriptState, RaisesException]
+    [CallWith=ScriptState, RaisesException, MeasureAs=WebCodecsVideoEncoder]
     constructor(VideoEncoderInit init);
 
     // The number of pending decode requests. This does not include requests that

third_party/blink/renderer/modules/webcodecs/video_track_reader.idl

@@ -8,7 +8,7 @@
     Exposed=Window,
     RuntimeEnabled=WebCodecs
 ] interface VideoTrackReader {
-  [CallWith=ScriptState, RaisesException]
+  [CallWith=ScriptState, RaisesException, MeasureAs=WebCodecsVideoTrackReader]
   constructor(MediaStreamTrack track);
 
   [RaisesException]

tools/metrics/histograms/enums.xml

@@ -28956,6 +28956,11 @@ Called by update_use_counter_feature_enum.py.-->
   <int value="3454" label="RTCPeerConnectionCreateAnswer"/>
   <int value="3455"
       label="V8AuthenticatorAttestationResponse_GetTransports_Method"/>
+  <int value="3456" label="WebCodecsAudioDecoder"/>
+  <int value="3457" label="WebCodecsVideoDecoder"/>
+  <int value="3458" label="WebCodecsVideoEncoder"/>
+  <int value="3459" label="WebCodecsVideoTrackReader"/>
+  <int value="3460" label="WebCodecsImageDecoder"/>
 </enum>
 
 <enum name="FeaturePolicyAllowlistType">