Enable css trace debugging for round(), mod(), and rem()

Fixed: 460412510
Change-Id: Idbc7b98d61538524a04e731266985f550cfac615
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7500340
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Auto-Submit: Eric Leese <leese@chromium.org>
Commit-Queue: Eric Leese <leese@chromium.org>
Commit-Queue: Philip Pfaffe <pfaffe@chromium.org>

Author: Eric Leese

front_end/core/sdk/CSSPropertyParserMatchers.ts

@@ -983,6 +983,9 @@ export const enum ArithmeticFunction {
   CALC = 'calc',
   SIBLING_COUNT = 'sibling-count',
   SIBLING_INDEX = 'sibling-index',
+  ROUND = 'round',
+  MOD = 'mod',
+  REM = 'rem',
 }
 type MathFunction = SelectFunction|ArithmeticFunction;
 
@@ -1000,6 +1003,9 @@ export class MathFunctionMatch extends BaseFunctionMatch<MathFunction> {
       case ArithmeticFunction.CALC:
       case ArithmeticFunction.SIBLING_COUNT:
       case ArithmeticFunction.SIBLING_INDEX:
+      case ArithmeticFunction.ROUND:
+      case ArithmeticFunction.MOD:
+      case ArithmeticFunction.REM:
         return true;
     }
     // This assignment catches missed values in the switch above.
@@ -1021,6 +1027,9 @@ export class MathFunctionMatcher extends matcherBase(MathFunctionMatch) {
       case ArithmeticFunction.CALC:
       case ArithmeticFunction.SIBLING_COUNT:
       case ArithmeticFunction.SIBLING_INDEX:
+      case ArithmeticFunction.ROUND:
+      case ArithmeticFunction.MOD:
+      case ArithmeticFunction.REM:
         return maybeFunc;
     }
     // This assignment catches missed values in the switch above.