[NaCl SDK] nacl_io: Added support for access() syscall.

native_client_sdk/src/libraries/nacl_io_test/kernel_proxy_test.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 <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/stat.h>
 
@@ skipping 264 matching lines @@
 
     return 0;
   }
 
  private:
   int node_mmap_count_;
 };
 
 class MountMockMMap : public Mount {
  public:
+  virtual Error Access(const Path& path, int a_mode) { return 0; }
+
   virtual Error Open(const Path& path, int mode, MountNode** out_node) {
     MountNodeMockMMap* node = new MountNodeMockMMap(this);
     *out_node = node;
     return 0;
   }
 
   virtual Error OpenResource(const Path& path, MountNode** out_node) {
     *out_node = NULL;
     return ENOSYS;
   }
@@ skipping 43 matching lines @@
   EXPECT_EQ(reinterpret_cast<void*>(0x3000), addr3);
   EXPECT_EQ(3, g_MMapCount);
 
   ki_close(fd);
 
   // We no longer track mmap'd regions, so munmap is a no-op.
   EXPECT_EQ(0, ki_munmap(reinterpret_cast<void*>(0x1000), 0x2800));
   // We don't track regions, so the mmap count hasn't changed.
   EXPECT_EQ(3, g_MMapCount);
 }