Added GLSL backend for ESSL translator.
Review URL: http://codereview.appspot.com/698041

git-svn-id: https://angleproject.googlecode.com/svn/trunk@69 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/ConstantUnion.h b/src/compiler/ConstantUnion.h
index b0ab971..d2a1ef8 100644
--- a/src/compiler/ConstantUnion.h
+++ b/src/compiler/ConstantUnion.h
@@ -272,7 +272,7 @@
         return returnValue;
     }
 
-    TBasicType getType() { return type; }
+    TBasicType getType() const { return type; }
 private:
 
     union  {