[UNIX] Add support for creating read only shared memory 
https://bugs.webkit.org/show_bug.cgi?id=131542
Summary [UNIX] Add support for creating read only shared memory
Carlos Garcia Campos
Reported 2014-04-11 08:57:22 PDT
In SharedMemory::createHandle() we can receive ReadOnly as protection parameter. We are creating the shared memory as read-write by default, and when creating a handle we duplicate the file descriptor that inherits the flags.
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