Reviewed by David Kilzer.

        Implement -connection:didReceiveDataArray: NSURLConnection delegate method
        https://bugs.webkit.org/show_bug.cgi?id=56838

        Add experimental support for the didReceiveDataArray callback on
        NSURLConnection. A RessourceHandleClient indicates its ability to
        handle this callback by returning true from supportsDataArray() method.
        Currently only SubresourceLoader uses this so we get the benefit for
        CSS, JS and image loads. For other clients we call didReceiveData with
        the CFData contents as before.

        * WebCore.xcodeproj/project.pbxproj:
        * loader/ResourceLoader.h:
        * loader/SubresourceLoader.h:
        (WebCore::SubresourceLoader::supportsDataArray):
        * loader/cf/SubresourceLoaderCF.cpp: Added.
        (WebCore::SubresourceLoader::didReceiveDataArray):
        * loader/mac/ResourceLoaderMac.mm:
        (WebCore::ResourceLoader::didReceiveDataArray):
        * platform/SharedBuffer.cpp:
        (WebCore::SharedBuffer::clear):
        (WebCore::SharedBuffer::buffer):
        * platform/SharedBuffer.h:
        * platform/cf/SharedBufferCF.cpp:
        (WebCore::SharedBuffer::append):
        (WebCore::SharedBuffer::copyDataArrayAndClear):
        * platform/network/ResourceHandleClient.h:
        (WebCore::ResourceHandleClient::supportsDataArray):
        (WebCore::ResourceHandleClient::didReceiveDataArray):
        * platform/network/mac/ResourceHandleMac.mm:
        (-[WebCoreResourceHandleAsDelegate connection:didReceiveDataArray:]):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@81710 268f45cc-cd09-0410-ab3c-d52691b4dbfc