[Temporal] Add PlainTime toString and non-intl toLocaleString

Also implement AOs:
ToTemporalRoundingMode, ToSmallestTemporalUnit, RoundNumberToIncrement, RoundTime, ToSecondsStringPrecision

Spec Text:
https://tc39.es/proposal-temporal/#sec-temporal.plaintime.prototype.tostring
https://tc39.es/proposal-temporal/#sec-temporal.plaintime.prototype.tolocalestring
https://tc39.es/proposal-temporal/#sec-temporal-totemporalroundingmode
https://tc39.es/proposal-temporal/#sec-temporal-tosmallesttemporalunit
https://tc39.es/proposal-temporal/#sec-temporal-roundnumbertoincrement
https://tc39.es/proposal-temporal/#sec-temporal-roundtime
https://tc39.es/proposal-temporal/#sec-temporal-tosecondsstringprecision

Bug: v8:11544
Change-Id: I47ea27e966232e89bab48bf15a48c2c00ce5e160
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3665937Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80792}

src/builtins/builtins-temporal.cc

@@ -58,10 +58,6 @@ TO_BE_IMPLEMENTED(TemporalPlainTimePrototypeUntil)
 TO_BE_IMPLEMENTED(TemporalPlainTimePrototypeSince)
 /* Temporal #sec-temporal.plaintime.prototype.round */
 TO_BE_IMPLEMENTED(TemporalPlainTimePrototypeRound)
-/* Temporal #sec-temporal.plaintime.prototype.tolocalestring */
-TO_BE_IMPLEMENTED(TemporalPlainTimePrototypeToLocaleString)
-/* Temporal #sec-temporal.plaintime.prototype.tostring */
-TO_BE_IMPLEMENTED(TemporalPlainTimePrototypeToString)
 
 /* Temporal.PlaneDateTime */
 /* Temporal #sec-temporal.plaindatetime.prototype.add */
@@ -408,6 +404,8 @@ TEMPORAL_PROTOTYPE_METHOD1(PlainTime, ToPlainDateTime, toPlainDateTime)
 TEMPORAL_PROTOTYPE_METHOD2(PlainTime, With, with)
 TEMPORAL_VALUE_OF(PlainTime)
 TEMPORAL_PROTOTYPE_METHOD0(PlainTime, ToJSON, toJSON)
+TEMPORAL_PROTOTYPE_METHOD2(PlainTime, ToLocaleString, toLocaleString)
+TEMPORAL_PROTOTYPE_METHOD1(PlainTime, ToString, toString)
 
 // PlainDateTime
 BUILTIN(TemporalPlainDateTimeConstructor) {

src/init/heap-symbols.h

@@ -43,7 +43,6 @@
   V(_, format_string, "format")                                     \
   V(_, fraction_string, "fraction")                                 \
   V(_, fractionalSecond_string, "fractionalSecond")                 \
-  V(_, fractionalSecondDigits_string, "fractionalSecondDigits")     \
   V(_, full_string, "full")                                         \
   V(_, granularity_string, "granularity")                           \
   V(_, grapheme_string, "grapheme")                                 \
@@ -239,6 +238,7 @@
   V(_, flags_string, "flags")                                         \
   V(_, Float32Array_string, "Float32Array")                           \
   V(_, Float64Array_string, "Float64Array")                           \
+  V(_, fractionalSecondDigits_string, "fractionalSecondDigits")       \
   V(_, from_string, "from")                                           \
   V(_, Function_string, "Function")                                   \
   V(_, function_native_code_string, "function () { [native code] }")  \

src/objects/js-temporal-objects.h

@@ -536,6 +536,16 @@ class JSTemporalPlainTime
   V8_WARN_UNUSED_RESULT static MaybeHandle<String> ToJSON(
       Isolate* isolate, Handle<JSTemporalPlainTime> plain_time);
 
+  // #sec-temporal.plaintime.prototype.tostring
+  V8_WARN_UNUSED_RESULT static MaybeHandle<String> ToString(
+      Isolate* isolate, Handle<JSTemporalPlainTime> plain_time,
+      Handle<Object> options);
+
+  // #sec-temporal.plaintime.prototype.tolocalestring
+  V8_WARN_UNUSED_RESULT static MaybeHandle<String> ToLocaleString(
+      Isolate* isolate, Handle<JSTemporalPlainTime> plain_time,
+      Handle<Object> locales, Handle<Object> options);
+
   DECL_PRINTER(JSTemporalPlainTime)
 
   DEFINE_TORQUE_GENERATED_JS_TEMPORAL_HOUR_MINUTE_SECOND()

test/test262/test262.status

@@ -1019,21 +1019,12 @@
   'built-ins/Temporal/PlainTime/prototype/subtract/non-integer-throws-rangeerror': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/subtract/order-of-operations': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/subtract/subclassing-ignored': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toLocaleString/branding': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toLocaleString/return-string': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/branding': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-invalid-string': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-nan': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-non-integer': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-out-of-range': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-undefined': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-wrong-type': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/options-undefined': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/roundingmode-invalid-string': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/roundingmode-undefined': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/roundingmode-wrong-type': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/smallestunit-invalid-string': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/smallestunit-plurals-accepted': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/smallestunit-undefined': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/smallestunit-valid-units': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/smallestunit-wrong-type': [FAIL],
@@ -1680,7 +1671,6 @@
   'built-ins/Temporal/PlainTime/prototype/toString/basic': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-auto': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/fractionalseconddigits-number': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/options-invalid': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/rounding-cross-midnight': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/roundingmode-ceil': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/toString/roundingmode-floor': [FAIL],
@@ -1920,7 +1910,6 @@
   'built-ins/Temporal/PlainTime/prototype/round/options-wrong-type': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/round/roundto-invalid-string': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/since/options-wrong-type': [FAIL],
-  'built-ins/Temporal/PlainTime/prototype/toString/options-wrong-type': [FAIL],
   'built-ins/Temporal/PlainTime/prototype/until/options-wrong-type': [FAIL],
   'built-ins/Temporal/PlainYearMonth/prototype/add/options-wrong-type': [FAIL],
   'built-ins/Temporal/PlainYearMonth/prototype/since/options-wrong-type': [FAIL],