Implement MSAA with GL_EXT_multisampled_render_to_texture

This implements MSAA using the GL_EXT_multisampled_render_to_texture
extension. This extension is more efficient that GLES3 MSAA on tiling
GPUs.

BUG=322706

Review URL: https://codereview.chromium.org/136793003

git-svn-id: svn://svn.chromium.org/blink/trunk@167559 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Make selector list pseudos work with class invalidation sets.

Selectors like :not and :-webkit-any have selector lists. Classes, ids and
tag names in those lists were not taken into account when building class
invalidation sets.

Re-introduce a white-list for supported pseudos and disallow :not and
:-webkit-any for now.

R=esprehn@chromium.org,chrishtr@chromium.org
BUG=344893

Review URL: https://codereview.chromium.org/174013010

git-svn-id: svn://svn.chromium.org/blink/trunk@167560 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Screen Orientation API: Add support for lockOrientation() / unlockOrientation()

Screen Orientation API: Add support for lockOrientation() / unlockOrientation().

The test infrastructure is currently missing to fully test the functionality.
It will be added in a follow-up patch.

R=abarth
BUG=162827
TEST=screen_orientation/lockOrientation-array-argument.html
TEST=screen_orientation/lockOrientation-bad-argument.html
TEST=screen_orientation/lockOrientation-bad-array-argument.html
TEST=screen_orientation/lockOrientation-basic.html

Review URL: https://codereview.chromium.org/171683015

git-svn-id: svn://svn.chromium.org/blink/trunk@167561 bbb929c8-8fbe-4397-9dbb-9b2b20218538