Fix net::FileStream to handle all errors correctly.

This CL adds FileStream::Context::IOResult struct that's used to pass 
results of IO operations inside FileStream::Context. Following bugs are 
fixes:

1. On POSIX net::FileStream::Read() and net::FileStream::Write() would
   return a positive result in case of an error. This happens because 
   POSIX errors are positive integers and FileStream was written with 
   assumption that they are negative.
2. On Windows Seek() and Flush() errors were not handled correctly.
   This is because CheckForIOError() was assuming that all error codes 
   are negative, but RecordAndMapError() was mapping positive errors.
3. On Windows results of asynchronous ReadFile() and WriteFile() were
   not handled correctly - ERR_IO_PENDING would be returned even when
   operation completes synchronously.

Also added unittests to check that error codes are handled correctly 
now.

Review URL: https://chromiumcodereview.appspot.com/12320003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@184257 0039d316-1c4b-4281-b951-d872f2087c98

0 files changed, 0 insertions, 0 deletions