Add UseCounters for referrerpolicy attributes

third_party/WebKit/Source/core/frame/UseCounter.h

Index: third_party/WebKit/Source/core/frame/UseCounter.h
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/UseCounter.h
index 0cb7058cfb056aadc61e907a1c9a24b1cec87dae..068036668bdeb65047446b9cb5689a2c400dce1b 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1424,6 +1424,10 @@ class CORE_EXPORT UseCounter {
     TopNavInSandboxWithPerm = 1751,
     TopNavInSandboxWithPermButNoGesture = 1752,
     ReferrerPolicyHeader = 1753,
+    HTMLAnchorElementReferrerPolicyAttribute = 1754,
+    HTMLIFrameElementReferrerPolicyAttribute = 1755,
+    HTMLImageElementReferrerPolicyAttribute = 1756,
+    HTMLLinkElementReferrerPolicyAttribute = 1757,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.