Allow POSIX callers to specify a new file's mode.

base/files/file_util_posix.cc

Index: base/files/file_util_posix.cc
diff --git a/base/files/file_util_posix.cc b/base/files/file_util_posix.cc
index 5a94cef661319e39b98ea10037113371b4a2d2ac..93275552e76468f55bc7b1c5aba67d9533a71aee 100644
--- a/base/files/file_util_posix.cc
+++ b/base/files/file_util_posix.cc
@@ -693,6 +693,18 @@ int WriteFile(const FilePath& filename, const char* data, int size) {
   return bytes_written;
 }
 
+bool WriteFileWithMode(const FilePath& filename, const char* data, int size,
+                       mode_t mode) {
+  ThreadRestrictions::AssertIOAllowed();
+  int fd = HANDLE_EINTR(creat(filename.value().c_str(), mode));

[rvargas (doing something else), 2014/10/22 00:57:38]

tiny nit: declare fd (or file) directly to be a ScopedFD here, and use
is_valid() below.

[palmer, 2014/10/22 01:03:02]

Done.

+  if (fd < 0)
+    return false;
+
+  ScopedFD file(fd);
+  bool status = WriteFileDescriptor(file.get(), data, size);

[rvargas (doing something else), 2014/10/22 00:57:38]

tiny nit: return directly here.

[palmer, 2014/10/22 01:03:02]

Done.

+  return status;
+}
+
 bool WriteFileDescriptor(const int fd, const char* data, int size) {
   // Allow for partial writes.
   ssize_t bytes_written_total = 0;