[Sync] Add full history sync experiment

[Sync] Add full history sync experiment

Turning the experiment on will enable the full history sync flag, which both
updates the history UI to use full history, but also enables the history
delete directives sync datatype.

BUG=141245
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=180037

[Nicolas Zea, 2013-01-31 02:06:29]

PTAL

[rlarocque, 2013-01-31 02:10:18]

LGTM

[commit-bot: I haz the power, 2013-01-31 19:50:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zea@chromium.org/12091081/2001

[commit-bot: I haz the power, 2013-01-31 19:54:04]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android_cl...

[commit-bot: I haz the power, 2013-01-31 20:39:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zea@chromium.org/12091081/13001

[commit-bot: I haz the power, 2013-01-31 21:14:24]

Sorry for I got bad news for ya.
Compile failed with a clobber build on linux_rel.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2013-01-31 21:23:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zea@chromium.org/12091081/13001

[commit-bot: I haz the power, 2013-02-01 01:51:52]

Change committed as 180037