SpdySession now sets the following fields in HttpResponseInfo: 

request_time 
response_time 
vary_data 

There is also a unit test to exercise the new functionality. 

- Changed CreateSpdyHeadersFromHttpRequest() to use std::string::append()
  rather than std::string::operator+() to append a single '\0' character
  to the string, as the former does nothing.

- Now using SpdyFramer.

- The unit tests now include all server push cases.

BUG=34505
TEST=Run netunittests.exe --gtest_filter=SpdyNetworkTransactionTest.* 

Review URL: http://codereview.chromium.org/634002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42660 0039d316-1c4b-4281-b951-d872f2087c98

• net/http/http_response_headers.cc[diff]
• net/http/http_response_headers.h[diff]
• net/socket/socket_test_util.cc[diff]
• net/socket/socket_test_util.h[diff]
• net/spdy/spdy_network_transaction_unittest.cc[diff]
• net/spdy/spdy_session.cc[diff]
• net/spdy/spdy_session.h[diff]
• net/spdy/spdy_stream.cc[diff]
• net/spdy/spdy_stream.h[diff]
• net/spdy/spdy_stream_unittest.cc[diff]