Implement multi-core builds in MSVS

visual_studio/NativeClientVSAddIn/InstallerResources/NaCl/Props/nacl_compile.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <Rule Name="CL" PageTemplate="tool" DisplayName="C/C++" SwitchPrefix="-" Order="10" xmlns="http://schemas.microsoft.com/build/2009/properties" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib">
 
   <Rule.Categories>
     <Category Name="General" DisplayName="General" />
     <Category Name="Optimization" DisplayName="Optimization" />
     <Category Name="Preprocessor" DisplayName="Preprocessor" />
     <Category Name="Code Generation" DisplayName="Code Generation" />
     <Category Name="Output Files" DisplayName="Output Files" />
@@ skipping 19 matching lines @@
   <BoolProperty Name="OutputCommandLine" DisplayName="Output Command Line" Category="General">
   </BoolProperty>
   <EnumProperty Name="ConfigurationType" DisplayName="Configuration Type" Category="General">
     <EnumValue Name="Application" DisplayName="Application (.nexe)" />
     <EnumValue Name="DynamicLibrary" DisplayName="Dynamic Library (.so)" Switch="shared"/>
     <EnumValue Name="StaticLibrary" DisplayName="Static library (.a)" />
   </EnumProperty>
   <BoolProperty Name="UserHeaderDependenciesOnly" Category="General" Visible="true" Switch="MMD">
   </BoolProperty>
 
-    <BoolProperty Name="PositionIndependentCode" DisplayName="Generate Position-Independent Code" Category="Code Generation" Switch="fpic">
+  <BoolProperty Name="PositionIndependentCode" DisplayName="Generate Position-Independent Code" Category="Code Generation" Switch="fpic">
   </BoolProperty>
+
+  <BoolProperty Name="MultiProcessorCompilation" DisplayName="Multi-processor Compilation" Description="Multi-processor Compilation" Category="General">
+  </BoolProperty>
+
+  <IntProperty Name="ProcessorNumber" DisplayName="Number of processors" Description="Number of processors." Category="General" Visible="false">
+  </IntProperty>
+
   <BoolProperty Name="ExceptionHandling" DisplayName="Enable C++ Exceptions" Category="Code Generation" Switch="fexceptions" ReverseSwitch="fno-exceptions">
   </BoolProperty>
 
   <EnumProperty Name="OptimizationLevel" DisplayName="Optimization" Category="Optimization">
     <EnumValue Name="O0" DisplayName="No Optimization" Switch="O0" >
     </EnumValue>
     <EnumValue Name="O1" DisplayName="Moderate Optimization" Switch="O1">
     </EnumValue>
     <EnumValue Name="O2" DisplayName="Full Optimization" Switch="O2">
     </EnumValue>
@@ skipping 25 matching lines @@
   <StringProperty Name="AdditionalOptions" DisplayName="Additional Options" Description="Additional Options" Category="Command Line">
   </StringProperty>
 
 
   <StringListProperty Name="SystemPreprocessorDefinitions" Category="General" Visible="false" Switch="D">
   </StringListProperty>
 
   <StringListProperty Subtype="folder" Name="SystemIncludeDirectories" Category="General" Visible="false" Switch="I">
   </StringListProperty>
 </Rule>