https://bugs.webkit.org/show_bug.cgi?id=25890
        Implement Network logging channel on Mac

        * platform/network/mac/ResourceHandleMac.mm:
        (WebCore::ResourceHandle::~ResourceHandle):
        (WebCore::ResourceHandle::start):
        (WebCore::ResourceHandle::cancel):
        (WebCore::ResourceHandle::setDefersLoading):
        (-[WebCoreResourceHandleAsDelegate connection:willSendRequest:redirectResponse:]):
        (-[WebCoreResourceHandleAsDelegate connectionShouldUseCredentialStorage:]):
        (-[WebCoreResourceHandleAsDelegate connection:didReceiveAuthenticationChallenge:]):
        (-[WebCoreResourceHandleAsDelegate connection:didCancelAuthenticationChallenge:]):
        (-[WebCoreResourceHandleAsDelegate connection:didReceiveResponse:]):
        (-[WebCoreResourceHandleAsDelegate connection:didReceiveData:lengthReceived:]):
        (-[WebCoreResourceHandleAsDelegate connection:willStopBufferingData:]):
        (-[WebCoreResourceHandleAsDelegate connection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite:]):
        (-[WebCoreResourceHandleAsDelegate connectionDidFinishLoading:]):
        (-[WebCoreResourceHandleAsDelegate connection:didFailWithError:]):
        (-[WebCoreResourceHandleAsDelegate connection:willCacheResponse:]):
        Added logging for async requests (as these are most interesting).



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43974 268f45cc-cd09-0410-ab3c-d52691b4dbfc