Implement multi-core builds in MSVS

visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs

Index: visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs
diff --git a/visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs b/visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs
index 776fa8b1694bb8b009ad4132d63a83aa61c8e113..050c56ed852a3870e69c75927fdd7b9fe119530c 100644
--- a/visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs
+++ b/visual_studio/NativeClientVSAddIn/NaCl.Build.CPPTasks/XamlParser.cs
@@ -39,7 +39,7 @@ namespace NaCl.Build.CPPTasks
             {
                 { typeof(StringListProperty), GenerateArgumentStringList },
                 { typeof(StringProperty), GenerateArgumentString },
-                { typeof(IntProperty), GenerateArgumentString },
+                { typeof(IntProperty), GenerateArgumentInt },
                 { typeof(BoolProperty), GenerateArgumentBool },
                 { typeof(EnumProperty), GenerateArgumentEnum }
             };
@@ -126,6 +126,12 @@ namespace NaCl.Build.CPPTasks
             AppendStringValue(builder, property, casted.Subtype, value);
         }
 
+        private void GenerateArgumentInt(CommandLineBuilder builder, BaseProperty property, string value)
+        {
+            // Currently we only have one Int property and it doesn't correspond to a
+            // command line arguemnt (ProcessorNumber) so we ignore it here.
+        }
+
         private void GenerateArgumentBool(CommandLineBuilder builder, BaseProperty property, string value)
         {
             if (value == "true")