Instrument the UUID properties of BluetoothRemoteGATT interfaces for the

identifiability study.

These IDL annotations will automatically generate instrumentation code
using blink::Dactyloscoper, to be used to determine how much entropy
these APIs leak about the users' cross-site identity.

Bug: 973801
Change-Id: I2eb31009e9bde2aa87871a7bb0a6adcff81250eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354535
Commit-Queue: Chris Fredrickson <cfredric@google.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798425}

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

@@ -2729,6 +2729,9 @@ enum WebFeature {
   kMediaRecorder_MimeType = 3399,
   kMediaRecorder_VideoBitsPerSecond = 3400,
   kMediaRecorder_AudioBitsPerSecond = 3401,
+  kBluetoothRemoteGATTCharacteristic_Uuid = 3402,
+  kBluetoothRemoteGATTDescriptor_Uuid = 3403,
+  kBluetoothRemoteGATTService_Uuid = 3404,
 
   // 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/bluetooth/bluetooth_remote_gatt_characteristic.idl

@@ -11,7 +11,7 @@
     SecureContext
 ] interface BluetoothRemoteGATTCharacteristic : EventTarget {
     [SameObject] readonly attribute BluetoothRemoteGATTService service;
-    readonly attribute UUID uuid;
+    [HighEntropy=Direct, MeasureAs=BluetoothRemoteGATTCharacteristic_Uuid] readonly attribute UUID uuid;
     readonly attribute BluetoothCharacteristicProperties properties;
     readonly attribute DataView? value;
     [RaisesException, CallWith=ScriptState, MeasureAs=WebBluetoothRemoteCharacteristicGetDescriptor] Promise<BluetoothRemoteGATTDescriptor> getDescriptor(BluetoothDescriptorUUID descriptor);

third_party/blink/renderer/modules/bluetooth/bluetooth_remote_gatt_descriptor.idl

@@ -12,7 +12,7 @@
     SecureContext
 ] interface BluetoothRemoteGATTDescriptor  {
     [SameObject] readonly attribute BluetoothRemoteGATTCharacteristic characteristic;
-    readonly attribute UUID uuid;
+    [HighEntropy=Direct, MeasureAs=BluetoothRemoteGATTDescriptor_Uuid] readonly attribute UUID uuid;
     readonly attribute DataView? value;
     [CallWith=ScriptState, RaisesException, MeasureAs=WebBluetoothRemoteDescriptorReadValue] Promise<DataView> readValue();
     [CallWith=ScriptState, RaisesException, MeasureAs=WebBluetoothRemoteDescriptorWriteValue] Promise<void> writeValue(BufferSource value);

third_party/blink/renderer/modules/bluetooth/bluetooth_remote_gatt_service.idl

@@ -10,7 +10,7 @@
     SecureContext
 ] interface BluetoothRemoteGATTService {
     [SameObject] readonly attribute BluetoothDevice device;
-    readonly attribute UUID uuid;
+    [HighEntropy=Direct, MeasureAs=BluetoothRemoteGATTService_Uuid] readonly attribute UUID uuid;
     readonly attribute boolean isPrimary;
     [RaisesException, CallWith=ScriptState, MeasureAs=WebBluetoothRemoteServiceGetCharacteristic] Promise<BluetoothRemoteGATTCharacteristic> getCharacteristic(BluetoothCharacteristicUUID characteristic);
     [RaisesException, CallWith=ScriptState, MeasureAs=WebBluetoothRemoteServiceGetCharacteristics] Promise<sequence<BluetoothRemoteGATTCharacteristic>> getCharacteristics(optional BluetoothCharacteristicUUID characteristic);

tools/metrics/histograms/enums.xml

@@ -28749,6 +28749,9 @@ Called by update_use_counter_feature_enum.py.-->
   <int value="3399" label="MediaRecorder_MimeType"/>
   <int value="3400" label="MediaRecorder_VideoBitsPerSecond"/>
   <int value="3401" label="MediaRecorder_AudioBitsPerSecond"/>
+  <int value="3402" label="BluetoothRemoteGATTCharacteristic_Uuid"/>
+  <int value="3403" label="BluetoothRemoteGATTDescriptor_Uuid"/>
+  <int value="3404" label="BluetoothRemoteGATTService_Uuid"/>
 </enum>
 
 <enum name="FeaturePolicyAllowlistType">