Instrument SVGTests.requiredExtensions and SVGTests.systemLanguage.

This is part of the identifiability study.

Bug: 973801
Change-Id: Iea741169b1066dcfc4db8bd5abdd0e0e44263101
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357513
Commit-Queue: Russ Hamilton <behamilton@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798809}

third_party/blink/renderer/core/frame/dactyloscoper.cc

@@ -48,6 +48,7 @@ void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
       .Record(document->UkmRecorder());
 }
 
+// static
 void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
                                         WebFeature feature,
                                         String str) {
@@ -59,6 +60,7 @@ void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
                                      IdentifiabilitySensitiveStringToken(str));
 }
 
+// static
 void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
                                         WebFeature feature,
                                         Vector<String> strs) {
@@ -73,6 +75,7 @@ void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
   Dactyloscoper::RecordDirectSurface(context, feature, builder.GetToken());
 }
 
+// static
 void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
                                         WebFeature feature,
                                         NotShared<DOMFloat32Array> buffer) {
@@ -86,4 +89,11 @@ void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
   Dactyloscoper::RecordDirectSurface(context, feature, builder.GetToken());
 }
 
+// static
+void Dactyloscoper::RecordDirectSurface(ExecutionContext* context,
+                                        WebFeature feature,
+                                        SVGStringListTearOff* strings) {
+  RecordDirectSurface(context, feature, strings->Target()->Values());
+}
+
 }  // namespace blink

third_party/blink/renderer/core/frame/dactyloscoper.h

@@ -8,6 +8,7 @@
 #include "third_party/blink/public/common/privacy_budget/identifiable_token.h"
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/core/frame/web_feature.h"
+#include "third_party/blink/renderer/core/svg/svg_string_list_tear_off.h"
 #include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
 #include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
 #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
@@ -38,6 +39,9 @@ class CORE_EXPORT Dactyloscoper {
   static void RecordDirectSurface(ExecutionContext*,
                                   WebFeature,
                                   NotShared<DOMFloat32Array>);
+  static void RecordDirectSurface(ExecutionContext*,
+                                  WebFeature,
+                                  SVGStringListTearOff*);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Dactyloscoper);

third_party/blink/renderer/core/svg/svg_tests.idl

@@ -27,6 +27,6 @@
 // https://svgwg.org/svg2-draft/types.html#InterfaceSVGTests
 
 interface mixin SVGTests {
-    [MeasureAs=SVG1DOMSVGTests] readonly attribute SVGStringList requiredExtensions;
-    [MeasureAs=SVG1DOMSVGTests] readonly attribute SVGStringList systemLanguage;
+    [HighEntropy=Direct, MeasureAs=SVG1DOMSVGTests] readonly attribute SVGStringList requiredExtensions;
+    [HighEntropy=Direct, MeasureAs=SVG1DOMSVGTests] readonly attribute SVGStringList systemLanguage;
 };