Add ListContainer::appendByMoving

Add ListContainer::appendByMoving

This patch implements "void ListContainer::appendByMoving(T item)" for
appending items to a ListContainer without copying. Because the source
item will not be destructed when moving to the destination, a new item
is constructed in-place to prevent double-destruction and dev sadness.
To support appending derived types when only the base type is known we
memcpy the largest possible element size.

This is the blink-side version of https://codereview.chromium.org/1202153002.

BUG=484943
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197685

[pdr., 2015-06-23 22:51:54]

pdr@chromium.org changed reviewers:
+ chrishtr@chromium.org

[chrishtr, 2015-06-23 22:53:23]

The CQ bit was checked by chrishtr@chromium.org

[chrishtr, 2015-06-23 22:53:24]

lgtm

[commit-bot: I haz the power, 2015-06-23 22:53:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1205733002/1

[commit-bot: I haz the power, 2015-06-23 23:01:19]

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

[commit-bot: I haz the power, 2015-06-23 23:01:20]

Try jobs failed on following builders:
  mac_blink_compile_dbg on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_compile_dbg/bu...)

[pdr., 2015-06-23 23:03:20]

The CQ bit was checked by pdr@chromium.org

[pdr., 2015-06-23 23:03:20]

The patchset sent to the CQ was uploaded after l-g-t-m from
chrishtr@chromium.org
Link to the patchset: https://codereview.chromium.org/1205733002/#ps20001
(title: "Appease compiler overlords")

[commit-bot: I haz the power, 2015-06-23 23:03:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1205733002/20001

[commit-bot: I haz the power, 2015-06-24 00:06:04]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197685