The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/56d48222c5118c41a4233f75b627ff7d6d1ae268

commit 56d48222c5118c41a4233f75b627ff7d6d1ae268
Author: gangwu <gangwu@chromium.org>
Date: Thu Oct 20 00:00:46 2016

[Sync] Enable Compression from Client to Server by experiment

Add padding to sync protobuff for mitigating CRIME attacks.

BUG= 653629 

Review-Url: https://chromiumcodereview.appspot.com/2380143002
Cr-Commit-Position: refs/heads/master@{#426343}

[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/BUILD.gn
[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/engine/net/DEPS
[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/engine/net/http_bridge.cc
[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/engine/net/http_bridge.h
[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/engine_impl/commit.cc
[modify] https://crrev.com/56d48222c5118c41a4233f75b627ff7d6d1ae268/components/sync/protocol/sync.proto

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/593d2c545acd93fb15a40a2a06421b1ea4d6ef81

commit 593d2c545acd93fb15a40a2a06421b1ea4d6ef81
Author: gangwu <gangwu@chromium.org>
Date: Mon Oct 31 21:19:39 2016

[Sync] Add tests for compression from client to server

BUG= 653629 

Review-Url: https://codereview.chromium.org/2466663002
Cr-Commit-Position: refs/heads/master@{#428814}

[modify] https://crrev.com/593d2c545acd93fb15a40a2a06421b1ea4d6ef81/components/sync/BUILD.gn
[modify] https://crrev.com/593d2c545acd93fb15a40a2a06421b1ea4d6ef81/components/sync/engine/net/http_bridge_unittest.cc