Prepare for late binding of SpdyHttpStreams.

* Move HostPortProxyPair to net/proxy/proxy_server.h.
* Have the Job assign the spdy_session_key to the Request when it's determined.
* Have the Job notify the HttpStreamFactoryImpl when a SpdySession becomes available.

Next steps:
* When HttpStreamFactoryImpl sees a SpdySession becomes available, service all applicable requests by examining their spdy_session_key.
* Introduce a new NetLog::Source for the late bound jobs.
* Have HttpStreamFactoryImpl create two Jobs instead of just 1 per Request if Alternate-Protocol is available.

BUG=54371,42669
TEST=existing

Review URL: http://codereview.chromium.org/6577035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76107 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/net.gyp b/net/net.gyp
index df9f2f8..bd14ccc 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -511,6 +511,8 @@
         'http/http_stream_factory_impl.h',
         'http/http_stream_factory_impl_job.cc',
         'http/http_stream_factory_impl_job.h',
+        'http/http_stream_factory_impl_request.cc',
+        'http/http_stream_factory_impl_request.h',
         'http/http_stream_parser.cc',
         'http/http_stream_parser.h',
         'http/http_transaction.h',