Console time/timeEnd label conversion

console/OWNERS

@@ -1,2 +1,3 @@
 @domenic
 @pwnall
+@domfarolino

console/console-time-label-conversion.any.js

@@ -0,0 +1,46 @@
+"use strict";
+// https://console.spec.whatwg.org/#timing
+
+test(() => {
+  let timeLabelToStringCalled = false;
+
+  console.time({
+    toString() {
+      timeLabelToStringCalled = true;
+    }
+  });
+
+  assert_true(timeLabelToStringCalled, "toString() must be called on time()'s label when label is an object");
+}, "console.time()'s label gets converted to string via label.toString() when label is an object");
+
+test(() => {
+  let timeEndLabelToStringCalled = false;
+
+  console.timeEnd({
+    toString() {
+      timeEndLabelToStringCalled = true;
+    }
+  });
+
+  assert_true(timeEndLabelToStringCalled, "toString() must be called on timeEnd()'s label when label is an object");
+}, "console.timeEnd()'s label gets converted to string via label.toString() when label is an object");
+
+test(() => {
+  assert_throws({name: "Error"}, () => {
+    console.time({
+      toString() {
+        throw new Error("conversion error");
+      }
+    });
+  }, "time() must re-throw any exceptions thrown by label.toString() conversion");
+}, "console.time() throws exceptions generated by erroneous label.toString() conversion");
+
+test(() => {
+  assert_throws({name: "Error"}, () => {
+    console.timeEnd({
+      toString() {
+        throw new Error("conversion error");
+      }
+    });
+  }, "timeEnd() must re-throw any exceptions thrown by label.toString() conversion");
+}, "console.timeEnd() throws exceptions generated by erroneous label.toString() conversion");

lint.whitelist

@@ -107,6 +107,7 @@ PRINT STATEMENT:encrypted-media/polyfill/make-polyfill-tests.py
 W3C-TEST.ORG:subresource-integrity/refresh-header.js.headers
 
 # semi-legitimate use of console.*
+CONSOLE:console/*
 CONSOLE:streams/resources/test-utils.js
 CONSOLE:service-workers/service-worker/resources/navigation-redirect-other-origin.html
 CONSOLE:service-workers/service-worker/navigation-redirect.https.html