DevTools: [CodeMirrro] defer autocomplete controller initialization

DevTools: [CodeMirrro] defer autocomplete controller initialization

Autocompletion controller intialization makes almost half of the time
of SourceFrame initialization.

In order to render editor as fast as possible, this patch defers
autocompletion initialization until the first need.

BUG=425550
R=vsevik

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184263

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184512

[lushnikov, 2014-10-22 14:46:09]

PTAL

[vsevik, 2014-10-22 14:48:09]

The CQ bit was checked by vsevik@chromium.org

[vsevik, 2014-10-22 14:48:10]

lgtm

[commit-bot: I haz the power, 2014-10-22 14:49:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/670163002/1

[commit-bot: I haz the power, 2014-10-22 15:50:00]

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

[commit-bot: I haz the power, 2014-10-22 15:50:01]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/3...)

[lushnikov, 2014-10-23 11:41:23]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-10-23 11:42:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/670163002/20001

[commit-bot: I haz the power, 2014-10-23 12:49:35]

Committed patchset #2 (id:20001) as 184263

[vsevik, 2014-10-27 14:44:33]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/676393003/ by vsevik@chromium.org.

The reason for reverting is: Breaks autocomplete (only ctrl+space works).

[lushnikov, 2014-10-28 10:29:27]

Please, take a look

[vsevik, 2014-10-28 11:17:33]

The CQ bit was checked by vsevik@chromium.org

[vsevik, 2014-10-28 11:17:34]

lgtm

[commit-bot: I haz the power, 2014-10-28 11:18:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/670163002/80001

[commit-bot: I haz the power, 2014-10-28 12:33:19]

Committed patchset #5 (id:80001) as 184512