Handle AddPreload/AddPendingPreload on UI thread.

Determine whether or not a prerender tag comes from a
currently prerendering RenderView on the UI thread, rather
than the IO thread.

BUG=none
TEST=PrerenderBrowserTest.PrerenderInfiniteLoop (Currently FLAKY).

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=86968

[mmenke, 2011-05-26 18:54:43]

Not exactly a vital CL, but simplifies things a little.

[dominich, 2011-05-26 19:01:08]

LGTM

I thought originally that it was best to do the check on IO to make sure that we
caught the request as soon as possible, but this is the right thing to do.

[mmenke, 2011-05-26 19:07:51]

Thanks.

I had been thinking it was an artifact of how the PrerenderResourceHandler used
to work.

On 2011/05/26 19:01:08, dominic wrote:
> LGTM
> 
> I thought originally that it was best to do the check on IO to make sure that
we
> caught the request as soon as possible, but this is the right thing to do.

[cbentzel, 2011-05-26 23:58:57]

LGTM

[commit-bot: I haz the power, 2011-05-27 04:11:11]

Change committed as 86968