Added PlatformHandle thunks.

shell/native_application_support.cc

Index: shell/native_application_support.cc
diff --git a/shell/native_application_support.cc b/shell/native_application_support.cc
index ce171dcbefe9a9e3961a645ac9ac9ebcba1a396f..11482fe6a8a78766e25016830b7f3a922d7654b5 100644
--- a/shell/native_application_support.cc
+++ b/shell/native_application_support.cc
@@ -24,6 +24,7 @@
 #include "mojo/public/platform/native/mgl_onscreen_thunks.h"
 #include "mojo/public/platform/native/mgl_signal_sync_point_thunks.h"
 #include "mojo/public/platform/native/mgl_thunks.h"
+#include "mojo/public/platform/native/platform_handle_private_thunks.h"
 #include "mojo/public/platform/native/system_impl_private_thunks.h"
 #include "mojo/public/platform/native/system_thunks.h"
 
@@ -74,6 +75,10 @@ bool RunNativeApplication(
     return false;
   }
 
+  // TODO(freiling): enforce the private nature of this API, somehow?
+  SetThunks(&MojoMakePlatformHandlePrivateThunks,
+            "MojoSetPlatformHandlePrivateThunks", app_library);
+
   // TODO(ncbray): enforce the private nature of this API, somehow?
   SetThunks(&MojoMakeSystemImplControlThunksPrivate,
             "MojoSetSystemImplControlThunksPrivate", app_library);