Implement trunc, round, roundEven (Emulated roundEven)

BUG=angle:934

Change-Id: If33256bf3707f3f0202147276c71f08c65518205
Reviewed-on: https://chromium-review.googlesource.com/254842
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/compiler/translator/intermOut.cpp b/src/compiler/translator/intermOut.cpp
index 614cdc4..07c50f0 100644
--- a/src/compiler/translator/intermOut.cpp
+++ b/src/compiler/translator/intermOut.cpp
@@ -327,6 +327,9 @@
       case EOpAbs:            out << "Absolute value";       break;
       case EOpSign:           out << "Sign";                 break;
       case EOpFloor:          out << "Floor";                break;
+      case EOpTrunc:          out << "Truncate";             break;
+      case EOpRound:          out << "Round";                break;
+      case EOpRoundEven:      out << "Round half even";      break;
       case EOpCeil:           out << "Ceiling";              break;
       case EOpFract:          out << "Fraction";             break;
       case EOpIsNan:          out << "Is not a number";      break;