Check that the PNaCl cache hash is truly derived from the bitcode content.

chrome/renderer/pepper/chrome_ppapi_interfaces.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/pepper/chrome_ppapi_interfaces.h"
 
+#include "chrome/renderer/pepper/ppb_nacl_hash_private_impl.h"
 #include "chrome/renderer/pepper/ppb_nacl_private_impl.h"
 #include "chrome/renderer/pepper/ppb_pdf_impl.h"
+#include "ppapi/c/private/ppb_nacl_hash_private.h"
 #include "ppapi/c/private/ppb_nacl_private.h"
 #include "ppapi/c/private/ppb_pdf.h"
 #include "webkit/plugins/ppapi/ppapi_interface_factory.h"
 
 namespace chrome {
 
 const void* ChromePPAPIInterfaceFactory(const std::string& interface_name) {
 #if !defined(DISABLE_NACL)
+  if (interface_name == PPB_NACL_HASH_PRIVATE_INTERFACE)
+    return PPB_NaCl_Hash_Private_Impl::GetInterface();
   if (interface_name == PPB_NACL_PRIVATE_INTERFACE)
     return PPB_NaCl_Private_Impl::GetInterface();
 #endif  // DISABLE_NACL
   if (interface_name == PPB_PDF_INTERFACE)
     return PPB_PDF_Impl::GetInterface();
   return NULL;
 }
 
 }  // namespace chrome