IDL compiler: constructor attributes

(Attributes named *Constructor.)
Pretty straightforward; some reordering for clarity.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/36793003

git-svn-id: svn://svn.chromium.org/blink/trunk@160434 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web Animations CSS: Add transitions tests to virtual/web-animations-css

BUG=271815
NOTRY=tried

Review URL: https://codereview.chromium.org/39353003

git-svn-id: svn://svn.chromium.org/blink/trunk@160435 bbb929c8-8fbe-4397-9dbb-9b2b20218538
MIDIAccessPromise cleanup

- Stop using {un}setPendingActivity to avoid counting mismatch
- Implement ActiveDOMObject::stop()

BUG=N/A
TEST=Layouttests/webmidi

Review URL: https://codereview.chromium.org/39233002

git-svn-id: svn://svn.chromium.org/blink/trunk@160436 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Gardening. Remove crash expectation for some web-animations-css/transitions tests.

These were fixed while the change to add them to the virtual suite was landing.

NOTRY=true
TBR=steveblock

Review URL: https://codereview.chromium.org/39873002

git-svn-id: svn://svn.chromium.org/blink/trunk@160437 bbb929c8-8fbe-4397-9dbb-9b2b20218538