Always populate the node map in SVGFilterBuilder if one exists

Always populate the node map in SVGFilterBuilder if one exists

Since the node map is essentially a "reverse DAG" we cannot have holes
in it, so always add the FilterEffects even we cannot provide the
LayoutObject -> FilterEffect mapping (like in the case of a non-attached
element.)

BUG=541593, 533457
Committed: https://crrev.com/fb79f7fc46552d45127acd2959a23662ad8f271e
Cr-Commit-Position: refs/heads/master@{#353620}

[fs, 2015-10-09 17:51:54]

fs@opera.com changed reviewers:
+ fmalita@chromium.org, pdr@chromium.org, senorblanco@chromium.org

[fs, 2015-10-09 18:52:29]

Doh!

[fs, 2015-10-12 12:27:47]

On 2015/10/09 at 18:52:29, fs (OoO) wrote:
> Doh!

Ping, PTAL. (Mild urgency)

[f(malita), 2015-10-12 12:55:57]

LGTM

(I don't have access to 541593, senorblanco should take a peek too.  If this is
urgent, feel free to land though - we can always revise later.)

[fs, 2015-10-12 20:32:35]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2015-10-12 20:34:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1393633007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1393633007/1

[commit-bot: I haz the power, 2015-10-12 23:16:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-12 23:16:56]

Patchset 1 (id:??) landed as
https://crrev.com/fb79f7fc46552d45127acd2959a23662ad8f271e
Cr-Commit-Position: refs/heads/master@{#353620}

[Stephen White, 2015-10-13 13:17:04]

LGTM