Implement GL_EXT_multisampled_render_to_texture in GraphicsContext3D

BUG=322706

Review URL: https://codereview.chromium.org/105823015

git-svn-id: svn://svn.chromium.org/blink/trunk@164070 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Simplify a case statement in Decimal.cpp slightly.

Handling for StateDot and StateDotDigit was identical save for a
"state = StateDotDigit;" in the StateDot case that's a no-op in the
StateDotDigit case anyway.

R=pkasting@chromium.org

Review URL: https://codereview.chromium.org/114093004

git-svn-id: svn://svn.chromium.org/blink/trunk@164071 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web Animations CSS: Strengthen some assertions now that functionality is implemented.

Review URL: https://codereview.chromium.org/117923003

git-svn-id: svn://svn.chromium.org/blink/trunk@164072 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Don't dispatch a 'click' event for mousedown/mouseup across form controls.

This CL fixes a regression by r162081 [1].

The behavior change by r162081 was correct according to the standard, however it
caused unexpected behavior on some sites.  IE11 doesn't dispatch a click event
if a mousedown event happened on a form control, and a mouseup event happened on
anoter element. We follow it.

[1] http://src.chromium.org/viewvc/blink?revision=162081&view=revision

BUG=328304, 329136
TEST=automated

Review URL: https://codereview.chromium.org/110173005

git-svn-id: svn://svn.chromium.org/blink/trunk@164073 bbb929c8-8fbe-4397-9dbb-9b2b20218538