Speculative crash fix in LinkStyle

Making sure LinkStyle::loadingFrame() is not null before use.

BUG=400564
TEST=none
R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/452563002

git-svn-id: svn://svn.chromium.org/blink/trunk@179763 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove custom style building for -webkit-font-feature-settings.

This patch replaces the custom style application for
-webkit-font-feature-settings with a function in StyleBuilderConverter.

Also:

 * Less use of CSSValue in FontBuilder.
 * We now handle 'initial' and 'inherit'.
 * Eliminates FontDescription::makeNormalFeatureSettings.

Note that in StyleBuilderConverter::convertFontFeatureSettings, the check
for isFontFeatureValue() is removed. Asserting (via toCSSFontFeatureValue)
should be enough, since the parser will only add CSSFontFeatureValues to the
list.

Review URL: https://codereview.chromium.org/444333005

git-svn-id: svn://svn.chromium.org/blink/trunk@179764 bbb929c8-8fbe-4397-9dbb-9b2b20218538
assertRendererClearedPaintInvalidationState is hit

It's possible that we don't mark until the root of
the render tree (see objectIsRelayoutBoundary) and
thus don't mark all the containing block chains for
paint invalidation. This causes us to leave some
renderer dirty after the paint invalidation phase.

BUG=399206

Review URL: https://codereview.chromium.org/442603003

git-svn-id: svn://svn.chromium.org/blink/trunk@179765 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r179756

http://src.chromium.org/viewvc/blink?view=revision&revision=179756

BUG=396225
TBR=dsinclair@chromium.org

Review URL: https://codereview.chromium.org/452663002

git-svn-id: svn://svn.chromium.org/blink/trunk@179766 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r179757

http://src.chromium.org/viewvc/blink?view=revision&revision=179757

BUG=394050
TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/448333002

git-svn-id: svn://svn.chromium.org/blink/trunk@179767 bbb929c8-8fbe-4397-9dbb-9b2b20218538