Some rebaselines in the spirit of https://groups.google.com/a/chromium.org/forum/#!search/on$20layout$20tests/blink-dev/hsPset9L06E/Evii--bVNwQJ

As best I can tell, these are all non-flaky results. Also, cleaned up
a few comments here and there.

TBR=adamk@chromium.org
BUG=237679

Review URL: https://codereview.chromium.org/18445003

git-svn-id: svn://svn.chromium.org/blink/trunk@153390 bbb929c8-8fbe-4397-9dbb-9b2b20218538
One layout test consistently fails on linux_clang

The layout test is
editing/execCommand/switch-list-type-with-orphaned-li.html. This CL
is just a short-term patch to get the trybots back to consistent green

BUG=255714
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/18208003

git-svn-id: svn://svn.chromium.org/blink/trunk@153391 bbb929c8-8fbe-4397-9dbb-9b2b20218538
New baselines for:
compositing/backface-visibility-transformed
compositing/backface-visibility/backface-visibility-non3d
compositing/perpendicular-layer-sorting

R=esprehn@chromium.org
BUG=255667

Review URL: https://codereview.chromium.org/18450002

git-svn-id: svn://svn.chromium.org/blink/trunk@153392 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Insert sampling tracing event macros to indexed/named properties

- Added PerformanceTests/Bindings/indexed-getter.html, which is a micro benchmark
that will be most affected by this CL.

- This CL regresses indexed-getter.html by 2.8%.

- This CL doesn't change performance of Dromaeo/dom-traverse's [childeNodes].
Given the fact, I think it's OK to land the CL. If you don't like the regression
of indexed-getter.html, I'm OK with not adding the macros to indexed getters which
are likely to be light-weight.

BUG=241743
R=abarth

Review URL: https://chromiumcodereview.appspot.com/18133009

git-svn-id: svn://svn.chromium.org/blink/trunk@153393 bbb929c8-8fbe-4397-9dbb-9b2b20218538
SVGViewSpec shouldn't use bloatedCharacters()

Fixing SVGViewSpec required fixing a bunch of code that it depends on to
understand narrow strings.

R=pdr,eseidel
BUG=254708

Review URL: https://chromiumcodereview.appspot.com/18418002

git-svn-id: svn://svn.chromium.org/blink/trunk@153394 bbb929c8-8fbe-4397-9dbb-9b2b20218538