Land Recent QUIC Changes until 03/25/2015.

Land Recent QUIC Changes until 03/25/2015.

A number of fixes to please clang_tidy.  There should be no functional
changes.

Putting the construction of a "null" SerializedPacket into a function
rather than constructing one into a local variable everywhere one is
needed.

Renaming class members to end with "_".  Taking the initial "k" off
local variables.

Merge internal change: 89397417
https://codereview.chromium.org/1039473003/

Move test for incoming packets with incorrect connection ID from
QuicConnection::OnPacketHeader to ::OnUnauthenticatedPublicHeader so it
works.

Add tests to verify code handles incoming packets with invalid
connection IDs.

Add DCHECKs to verify that QuicConnection::OnPublicResetPacket and
::OnVersionNegotiationPacket don't get packets with invalid
connection IDs.

Add comment to QuicConnection::ProcessUdpPacket to note packet may have
incorrect connection ID.

Fix b/19710533.

Merge internal change: 89336249
https://codereview.chromium.org/1038293002/

Fix a flaky QUIC end to end test by supplying the correct buffer size as
the initial default.

Merge internal change: 89220759
https://codereview.chromium.org/1038223002/

Initialize slowstart_packets_sent.

Avoid uninitialized memory.

Merge internal change: 89126237
https://codereview.chromium.org/1036123002/

QUIC - minor cleanup while merging the following change.

In Chromium's AddToCache function, we use "www.google.com" instead of
empty path as it was done in the internal CL. All other changes were
already merged by rch.

Make some changes to the QuicInMemory server to clarify the interface.
Specifically that the cache is indexed by host and path, not by method
nor scheme, nor full URL, nor request headers, etc. In preparation for
making the chrome version more similar.

Merge internal change: 89092881
https://codereview.chromium.org/1038203002/

R=rch@chromium.org

Committed: https://crrev.com/95293808942643749bb054446e915f22937a2e97
Cr-Commit-Position: refs/heads/master@{#322616}

[Ryan Hamilton, 2015-03-27 18:54:22]

lgtm

[ramant (doing other things), 2015-03-27 18:54:36]

The CQ bit was checked by rtenneti@chromium.org

[commit-bot: I haz the power, 2015-03-27 18:55:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1041853002/1

[commit-bot: I haz the power, 2015-03-27 18:59:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 19:00:13]

Patchset 1 (id:??) landed as
https://crrev.com/95293808942643749bb054446e915f22937a2e97
Cr-Commit-Position: refs/heads/master@{#322616}