Only commit cookie changes in prerenders after a prerender is shown

Only commit cookie changes in prerenders after a prerender is shown
Will create a PrerenderCookieStore for each prerender, retaining all cookie
operations of a prerender until the prerender is shown to the user.
Forces prerenders to be in a new render process by themselves for this to work.
BUG=371003
This is a resubmission of https://codereview.chromium.org/233353003, which had
to be reverted due to build breaks. See LGTM's there.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269855

[tburkard, 2014-05-12 20:00:35]

Committed patchset #2 manually as r269855.

[piman, 2014-05-12 21:21:44]

This broke again -
http://build.chromium.org/p/chromium.mac/buildstatus?builder=Mac%2010.7%20Tes...

Please don't reland manually without a full round of trybots, or through the CQ.

[tburkard, 2014-05-12 21:33:48]

Sorry about that.

Will be more careful.

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