Allow out-of-process iframes to paint in --site-per-process.

Allow out-of-process iframes to paint in --site-per-process.

This is a quick hack to make the initializeChildFrame message go through
RenderFrameProxy rather than RenderFrameImpl, since the RenderFrameHost
is deleted before it can receive the message.

We can clean up the hack by moving initializeChildFrame to
WebRemoteFrameClient and removing WebFrame::setIsRemote.

BUG=416102, 407160
TEST=Simple OOPIF paints in --site-per-process.

Committed: https://crrev.com/67c253e78c2bc1aa3f6f4123b4b3ccfbcea7068c
Cr-Commit-Position: refs/heads/master@{#295813}

[Charlie Reis, 2014-09-19 19:24:02]

creis@chromium.org changed reviewers:
+ nasko@chromium.org

[Charlie Reis, 2014-09-19 19:24:03]

Nasko: Here's the hack I mentioned to get OOPIFs painting again, by sending
initializeChildFrame via RenderFrameProxy.  Thoughts?

Alex can do the proper fix by removing setIsRemote and sending it via
WebRemoteFrameClient.

[nasko, 2014-09-19 21:11:37]

LGTM

[Charlie Reis, 2014-09-19 21:16:17]

The CQ bit was checked by creis@chromium.org

[commit-bot: I haz the power, 2014-09-19 21:17:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/591503003/1

[commit-bot: I haz the power, 2014-09-19 21:17:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/591503003/1

[commit-bot: I haz the power, 2014-09-19 22:20:18]

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

[commit-bot: I haz the power, 2014-09-19 22:20:20]

Try jobs failed on following builders:
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)

[Charlie Reis, 2014-09-19 22:32:33]

The CQ bit was checked by creis@chromium.org

[commit-bot: I haz the power, 2014-09-19 22:33:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/591503003/1

[commit-bot: I haz the power, 2014-09-19 22:33:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/591503003/1

[commit-bot: I haz the power, 2014-09-19 23:18:21]

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

[commit-bot: I haz the power, 2014-09-19 23:18:21]

Failed to commit the patch.

[Charlie Reis, 2014-09-19 23:37:57]

The CQ bit was checked by creis@chromium.org

[commit-bot: I haz the power, 2014-09-19 23:38:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/591503003/1

[commit-bot: I haz the power, 2014-09-19 23:39:41]

Committed patchset #1 (id:1) as 918acbe63dbc5f0ab379080947810d4254343781

[commit-bot: I haz the power, 2014-09-19 23:41:03]

Patchset 1 (id:??) landed as
https://crrev.com/67c253e78c2bc1aa3f6f4123b4b3ccfbcea7068c
Cr-Commit-Position: refs/heads/master@{#295813}