Suppress another FontConfig 'leak'.

Suppress another FontConfig 'leak'.

FontConfig uses offsets for elements instead of pointers, so any value
held by an element goes missing from memory checkers. Previous
suppressions took care of rule copies and adds to elements, but value
lists may be copied as well. When they are, values are copied, including
the content of strings and matricies. Since value lists are effectively
like Fc*Add functions (even calling the same underlying helpers), treat
them as such and suppress any 'leaks' they may cause.

Committed: https://skia.googlesource.com/skia/+/8d9225ba78c05194fdffc05ee8bdd5c15b7367ff

[bungeman-skia, 2015-02-05 17:00:56]

bungeman@google.com changed reviewers:
+ mtklein@google.com

[bungeman-skia, 2015-02-05 17:00:57]

Proposed alternate to https://codereview.chromium.org/897953006/ . This allows
us to still track the actual pointer returned from FcFontRenderPrepare.

[mtklein, 2015-02-05 17:05:32]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-02-05 17:05:33]

lgtm

lgtm, thanks, got distracted.

[commit-bot: I haz the power, 2015-02-05 17:05:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/894863003/1

[commit-bot: I haz the power, 2015-02-05 17:11:50]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/8d9225ba78c05194fdffc05ee8bdd5c15b7367ff