Reviewed by Laszlo Gombos.

        [Qt][WK2][Symbian] Shared memory implementation for Symbian
        https://bugs.webkit.org/show_bug.cgi?id=55875

        * wtf/Platform.h: Exclude Symbian OS from USE(UNIX_DOMAIN_SOCKETS) users
2011-05-16  Siddharth Mathur  <siddharth.mathur@nokia.com>

        Reviewed by Laszlo Gombos.

        [Qt][WK2][Symbian] Shared memory implementation for Symbian
        https://bugs.webkit.org/show_bug.cgi?id=55875

        Use global chunks for sharing data between processes.
        This is an initial implementation. An outstanding issue
        is the correct way to close() the chunk in the SharedMemory d'tor
        without triggering a delete by the kernel when the ref-count
        temporarily goes to zero.

        * Platform/SharedMemory.h: platform specific handle and chunk name
        * Platform/qt/SharedMemorySymbian.cpp: Added. Native Symbian OS implementation
        using RChunk.CreateGlobal() for named chunks. The chunk name is serialized
        and sent over the IPC channel and opened by the remote process using
        RChunk.OpenGlobal().

        (WebKit::SharedMemory::Handle::Handle):
        (WebKit::SharedMemory::Handle::~Handle):
        (WebKit::SharedMemory::Handle::isNull):
        (WebKit::SharedMemory::Handle::encode):
        (WebKit::SharedMemory::Handle::decode):
        (WebKit::SharedMemory::create):
        (WebKit::SharedMemory::~SharedMemory):
        (WebKit::SharedMemory::createHandle):
        (WebKit::SharedMemory::systemPageSize):
        * Platform/unix/SharedMemoryUnix.cpp: Exclude Qt-Symbian using HAVE(UNIX_DOMAIN_SOCKETS)
        * WebKit2.pro: Add SharedMemorySymbian.cpp

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86560 268f45cc-cd09-0410-ab3c-d52691b4dbfc