IDL compiler: sync Python to r162776

Python side to:
Make IDL Callbacks non-refcounted by default
https://codereview.chromium.org/85263006

Slightly more involved than other syncs
(new logic, not just changing content).
This finishes the syncing to last week's Perl changes.

BUG=239771
BUG=323681
NOTRY=true

Review URL: https://codereview.chromium.org/98173002

git-svn-id: svn://svn.chromium.org/blink/trunk@162947 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Disable experimental subpixel font scaling on mac

The experimental subpixel font scaling feature made a couple of SVG
text test flaky on Mac. Temporarily disable it while investigating.

BUG=324553
R=leviw@chromium.org

Review URL: https://codereview.chromium.org/97953002

git-svn-id: svn://svn.chromium.org/blink/trunk@162948 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web Animations CSS: Adding manual test for animation-delay on compositor.

(Bug this test reveals is fixed in https://codereview.chromium.org/96093002/)

BUG=324378,324670

Review URL: https://codereview.chromium.org/96123002

git-svn-id: svn://svn.chromium.org/blink/trunk@162949 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix for the FIXME in testing.gyp

DumpRenderTree is gone since a log time now. Merge this resource target
where it is used in web_tests.gyp.

BUG=None
TEST=webkit_unit_tests
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/97933002

git-svn-id: svn://svn.chromium.org/blink/trunk@162951 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move textAlignmentForLine to RenderBlockFlow

We're moving to a world where only RenderBlockFlows hold onto and layout
line box trees.

BUG=302024

Review URL: https://codereview.chromium.org/98123002

git-svn-id: svn://svn.chromium.org/blink/trunk@162952 bbb929c8-8fbe-4397-9dbb-9b2b20218538