[NaCl Addin] Add new property for setting name of index page.

visual_studio/NativeClientVSAddIn/InstallerResources/PPAPI_Patch/Props/ppapi_general.xml.patch

 <Rule
       Name="ConfigurationGeneral"
       DisplayName="General"
       PageTemplate="generic"
       Description="General"
       xmlns="http://schemas.microsoft.com/build/2009/properties">
   <Rule.Categories>
     <Category Name="ProjectDefaults" DisplayName="Project Defaults" Description="Project Defaults" />
     <PatchAdd>
       <Category Name="NativeClient" DisplayName="Native Client" Description="Native Client General Properties" />
@@ skipping 19 matching lines @@
     </StringProperty>
 
     <StringProperty Name="NaClWebServerPort" DisplayName="Web Server Port"
                   Description="Specifies the port number to use while hosting the Pepper Plugin"
                   Category="NativeClient" Default=""
                   F1Keyword="VC.Project.VCConfiguration.NaClWebServerPort">
       <StringProperty.DataSource>
         <DataSource Persistence="ProjectFile" Label="" />
       </StringProperty.DataSource>
     </StringProperty>
+
+    <StringProperty Name="NaClIndexHTML" DisplayName="Index page of NaCl Application"
+                  Description="Specifies the name of the web page that hosts the NaCl content"
+                  Category="NativeClient" Default=""
+                  F1Keyword="VC.Project.VCConfiguration.NaClIndexHTML">
+    </StringProperty>
+
   </PatchAdd>
 
   <EnumProperty Name="ConfigurationType" DisplayName="Configuration Type"
                 Description="Specifies the type of output this configuration generates."
                 Category="ProjectDefaults"
                 F1Keyword="VC.Project.VCConfiguration.ConfigurationType">
     <PatchRemove>
       <EnumValue Name="Makefile" DisplayName="Makefile" Description="Makefile" />
       <EnumValue Name="Application" DisplayName="Application (.exe)" Description="Application (.exe)" />
       <EnumValue Name="DynamicLibrary" DisplayName="Dynamic Library (.dll)" Description="Dynamic Library (.dll)" />
       <EnumValue Name="StaticLibrary" DisplayName="Static library (.lib)" Description="Static Library (.lib)" />
       <EnumValue Name="Utility" DisplayName="Utility" Description="Utility" />
     </PatchRemove>
     <PatchAdd>
       <EnumValue Name="DynamicLibrary" DisplayName="Dynamic Library (.dll)" Description="Dynamic Library (.dll)" />
       <EnumValue Name="StaticLibrary" DisplayName="Static library (.lib)" Description="Static Library (.lib)" />
     </PatchAdd>
   </EnumProperty>
 </Rule>