Some changes to prepare for endian change for QUIC: 1) Make data reader/write be able to read/write…

Some changes to prepare for endian change for QUIC: 1) Make data reader/write be able to read/write integers and floating numbers in big endian. 2) Make data reader/write be able to read/write 24/40/48/56-bit integers. 3) Add functions to read/write QuicPacketNumber, QuicStreamId, QuicStreamOffset in QuicFramer.

No functional change expected. Not protected.

Merge internal change: 153820887

R=zhongyi@chromium.org
BUG=

[Fan Yang, 2017-04-27 13:52:57]

The CQ bit was checked by fayang@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-27 13:53:29]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-27 14:29:21]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-27 14:29:22]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[Zhongyi Shi, 2017-04-27 18:14:04]

https://codereview.chromium.org/2847753002/diff/1/net/quic/core/quic_data_wri...
File net/quic/core/quic_data_writer_test.cc (right):

https://codereview.chromium.org/2847753002/diff/1/net/quic/core/quic_data_wri...
net/quic/core/quic_data_writer_test.cc:189: uint16_t encoded_ufloat =
reinterpret_cast<uint16_t>(test_cases[i].encoded);
TestCast::encoded fied by default is uint16_t, it seems the casting is
redundant. And there're some windows bots complaining about this cast. You might
consider fix this in the Final landing CL and merge the change back.

[Zhongyi Shi, 2017-04-27 20:00:08]

lgtm