Add PNaCl support for VS addin.

visual_studio/NativeClientVSAddIn/InstallerResources/NaCl/NaCl.CppBuild.targets

 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <PropertyGroup>
     <UseDefaultProjectTools>false</UseDefaultProjectTools>
     <UseDefaultPropertyPageSchemas>false</UseDefaultPropertyPageSchemas>
     <UseDefaultGeneralPropertyPageSchema>false</UseDefaultGeneralPropertyPageSchema>
   </PropertyGroup>
 
   <!-- Property pages -->
 
@@ skipping 26 matching lines @@
     </PropertyPageSchema>
 
     <!-- Switch view between project property based directories and environment variables -->
     <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_directories.xml" />
 
     <!-- Non-Utility project property pages -->
     <PropertyPageSchema Condition="'$(ConfigurationType)' != 'Utility'" Include="
         $(VCTargetsPath)\NaCl\Props\nacl_compile.xml;
         $(VCTargetsPath)$(LangID)\custom_build_step.xml;
     "/>
-    <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_link.xml" Condition="'$(ConfigurationType)' == 'Application' or '$(ConfigurationType)' == 'DynamicLibrary'" />
+    <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\pnacl_link.xml" Condition="'$(Platform)' == 'PNaCl' and ('$(ConfigurationType)' == 'Application' or '$(ConfigurationType)' == 'DynamicLibrary')" />
+    <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_link.xml" Condition="'$(Platform)' != 'PNaCl' and ('$(ConfigurationType)' == 'Application' or '$(ConfigurationType)' == 'DynamicLibrary')" />
     <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_lib.xml" Condition="'$(ConfigurationType)' == 'StaticLibrary'" />
   </ItemGroup>
 
   <ItemGroup>
     <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_general.xml">
       <Context>Project</Context>
     </PropertyPageSchema>
     <PropertyPageSchema Include="$(VCTargetsPath)\NaCl\Props\nacl_general_ps.xml">
       <Context>PropertySheet</Context>
     </PropertyPageSchema>
   </ItemGroup>
 
   <!-- Tools that show up in the IDE property pages for exe and dll projects -->
   <ItemGroup Condition="('$(ConfigurationType)' == 'Application' or '$(ConfigurationType)' == 'DynamicLibrary')">
     <ProjectTools Include="Link"/>
     <ProjectTools Include="CustomBuildStep"/>
   </ItemGroup>
 
   <!-- Tools that show up in the IDE property pages for lib project-->
   <ItemGroup Condition="'$(ConfigurationType)' == 'StaticLibrary'">
     <ProjectTools Include="Lib"/>
     <ProjectTools Include="CustomBuildStep"/>
   </ItemGroup>
 
 </Project>