Adaptively use temp dir instead of /dev/shm for executable shmem file on Linux

base/shared_memory_posix.cc

 // Copyright (c) 2011 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 "base/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ skipping 105 matching lines @@
 
   FILE *fp;
   bool fix_size = true;
 
   FilePath path;
   if (options.name == NULL || options.name->empty()) {
     // It doesn't make sense to have a open-existing private piece of shmem
     DCHECK(!options.open_existing);
     // Q: Why not use the shm_open() etc. APIs?
     // A: Because they're limited to 4mb on OS X.  FFFFFFFUUUUUUUUUUU
-    fp = file_util::CreateAndOpenTemporaryShmemFile(&path);
+    fp = file_util::CreateAndOpenTemporaryShmemFile(&path, options.executable);
 
     // Deleting the file prevents anyone else from mapping it in
     // (making it private), and prevents the need for cleanup (once
     // the last fd is closed, it is truly freed).
     if (fp)
       file_util::Delete(path, false);
 
   } else {
     if (!FilePathForMemoryName(*options.name, &path))
       return false;
@@ skipping 173 matching lines @@
 // (and possibly create).  Modifies |filename|.  Return false on
 // error, or true of we are happy.
 bool SharedMemory::FilePathForMemoryName(const std::string& mem_name,
                                          FilePath* path) {
   // mem_name will be used for a filename; make sure it doesn't
   // contain anything which will confuse us.
   DCHECK_EQ(std::string::npos, mem_name.find('/'));
   DCHECK_EQ(std::string::npos, mem_name.find('\0'));
 
   FilePath temp_dir;
-  if (!file_util::GetShmemTempDir(&temp_dir))
+  if (!file_util::GetShmemTempDir(&temp_dir, false))
     return false;
 
 #if !defined(OS_MACOSX)
 #if defined(GOOGLE_CHROME_BUILD)
   std::string name_base = std::string("com.google.Chrome");
 #else
   std::string name_base = std::string("org.chromium.Chromium");
 #endif
 #else  // OS_MACOSX
   std::string name_base = std::string(base::mac::BaseBundleID());
@@ skipping 29 matching lines @@
   new_handle->fd = new_fd;
   new_handle->auto_close = true;
 
   if (close_self)
     Close();
 
   return true;
 }
 
 }  // namespace base