Avoid zero resizing on prerender swap-in.

Avoid zero resizing on prerender swap-in.

On swapping in a prerendered WebContents a new ContentViewCore is created with zero size. When showing the view with onShow(), a resize event is generated, causing Blink to relayout with zero size. This change workaround it by setting the view size in advance.

BUG=340987
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251015

[Shuhei Takahashi (google), 2014-02-12 13:42:54]

Ted, could you review this change?

Also please do not put this change into CQ even if it lgty. I'm now testing this
patch by (pre-)rendering thousands of web pages to see prerendered result
matches with normally rendered result.

[Shuhei Takahashi (google), 2014-02-13 01:30:28]

Tested with 100 wikipedia articles, 100 yahoo answers pages, 300 random websites
and all looked perfect.

[Ted C, 2014-02-13 01:44:31]

lgtm

[Shuhei Takahashi, 2014-02-13 01:47:40]

Thanks for reviewing! Sending to CQ.

[Shuhei Takahashi, 2014-02-13 01:47:50]

The CQ bit was checked by nya@chromium.org

[commit-bot: I haz the power, 2014-02-13 01:51:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nya@chromium.org/159853008/30001

[commit-bot: I haz the power, 2014-02-13 03:06:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-02-13 03:06:22]

Retried try job too often on win_rel for step(s) base_unittests, browser_tests,
interactive_ui_tests, net_unittests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[Shuhei Takahashi, 2014-02-13 03:39:17]

The CQ bit was checked by nya@chromium.org

[commit-bot: I haz the power, 2014-02-13 03:41:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nya@chromium.org/159853008/30001

[commit-bot: I haz the power, 2014-02-13 15:17:20]

Change committed as 251015