OOP PDF: Allow print preview to handle key events when the plugin has focus

OOP PDF: Allow print preview to handle key events when the plugin has focus

Since the plugin is inside an iframe, key events that are sent to it when it is focussed do not propagate to the parent frame. We pass these on to the parent frame in the same way that we pass key events to the plugin when they are not handled by the print preview UI.

BUG=449903
Committed: https://crrev.com/85b3edeac5068d95fc4ebeea92f1cbc1c0b27a3f
Cr-Commit-Position: refs/heads/master@{#314438}

[raymes, 2015-01-30 04:15:25]

raymes@chromium.org changed reviewers:
+ sammc@chromium.org

[Sam McNally, 2015-01-30 06:18:43]

lgtm

[raymes, 2015-02-01 23:35:32]

raymes@chromium.org changed reviewers:
+ alekseys@chromium.org

[raymes, 2015-02-01 23:35:33]

+alekseys for chrome/browser/resources/print_preview/*

[Aleksey Shlyapnikov, 2015-02-03 21:31:41]

lgtm

[raymes, 2015-02-03 22:54:44]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-02-03 22:55:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/885813003/100001

[commit-bot: I haz the power, 2015-02-03 23:41:22]

Committed patchset #6 (id:100001)

[commit-bot: I haz the power, 2015-02-03 23:43:59]

Patchset 6 (id:??) landed as
https://crrev.com/85b3edeac5068d95fc4ebeea92f1cbc1c0b27a3f
Cr-Commit-Position: refs/heads/master@{#314438}