Add QuicTransport related use counters

Bug: 1011392
Change-Id: Id4bf79d0d2c69566465d73c1cfc42cb47e62c858
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096323Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749053}

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

@@ -2522,6 +2522,9 @@ enum WebFeature {
   kV8RTCRtpSender_CreateEncodedVideoStreams_Method = 3181,
   kV8RTCRtpReceiver_CreateEncodedAudioStreams_Method = 3182,
   kV8RTCRtpReceiver_CreateEncodedVideoStreams_Method = 3183,
+  kQuicTransport = 3184,
+  kQuicTransportStreamApis = 3185,
+  kQuicTransportDatagramApis = 3186,
 
   // 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/webtransport/quic_transport.idl

@@ -8,7 +8,7 @@
     Exposed=(Window,Worker),
     RuntimeEnabled=QuicTransport
 ] interface QuicTransport {
-  [CallWith=ScriptState, RaisesException] constructor(USVString url);
+  [CallWith=ScriptState, RaisesException, MeasureAs=QuicTransport] constructor(USVString url);
   // QuicTransport is the first, and at this moment only, transport which is
   // implemented. In the (draft) spec there are many mix-in interfaces which
   // QuicTransport includes, but we define all their methods/attributes here
@@ -17,12 +17,12 @@
   // From UnidirectionalStreamsTransport
   // TODO(ricea): Change this to Promise<SendStream> once the IDL compiler is
   // fixed. See https://crbug.com/1047113.
-  [CallWith=ScriptState, RaisesException] Promise<SendStream>
+  [CallWith=ScriptState, RaisesException, MeasureAs=QuicTransportStreamApis] Promise<SendStream>
       createSendStream();
 
   // From DatagramTransport mixin
-  WritableStream sendDatagrams();
-  ReadableStream receiveDatagrams();
+  [MeasureAs=QuicTransportDatagramApis] WritableStream sendDatagrams();
+  [MeasureAs=QuicTransportDatagramApis] ReadableStream receiveDatagrams();
 
   // From WebTransport mixin
   void close(optional WebTransportCloseInfo closeInfo = {});

tools/metrics/histograms/enums.xml

@@ -23458,7 +23458,8 @@ to ensure that the crash string is shown properly on the user-facing crash UI.
 </enum>
 
 <enum name="FeatureObserver">
-<!-- Generated from third_party/blink/public/mojom/web_feature/web_feature.mojom.-->
+<!-- Generated from third_party/blink/public/mojom/web_feature/web_feature.mojom.
+Called by update_use_counter_feature_enum.py.-->
 
   <int value="0" label="OBSOLETE_PageDestruction"/>
   <int value="1" label="LegacyNotifications"/>
@@ -26762,6 +26763,9 @@ to ensure that the crash string is shown properly on the user-facing crash UI.
   <int value="3181" label="V8RTCRtpSender_CreateEncodedVideoStreams_Method"/>
   <int value="3182" label="V8RTCRtpReceiver_CreateEncodedAudioStreams_Method"/>
   <int value="3183" label="V8RTCRtpReceiver_CreateEncodedVideoStreams_Method"/>
+  <int value="3184" label="QuicTransport"/>
+  <int value="3185" label="QuicTransportStreamApis"/>
+  <int value="3186" label="QuicTransportDatagramApis"/>
 </enum>
 
 <enum name="FeaturePolicyAllowlistType">