Rename devtools-timeline trace category to devtools.timeline

Also use Timeline event names instead of instrumented method names as we actually instrument only parts of the methods.

BUG=361045

Review URL: https://codereview.chromium.org/247463002

git-svn-id: svn://svn.chromium.org/blink/trunk@172151 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Screen Orientation: fire event on Window instead of Screen.

This is following spec discussions in public-webapps.

BUG=162827

Review URL: https://codereview.chromium.org/241203003

git-svn-id: svn://svn.chromium.org/blink/trunk@172152 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Avoid unnecessary extra calls to  RenderBlockFlow::addIntrudingFloats()

The first inflow block in a container that has a leading float will call
addIntrudingFloats twice. Adjust the logic to avoid this unnecessary extra
call.

Review URL: https://codereview.chromium.org/235933006

git-svn-id: svn://svn.chromium.org/blink/trunk@172156 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add some FIXMEs.

TBR=abarth@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/247613004

git-svn-id: svn://svn.chromium.org/blink/trunk@172157 bbb929c8-8fbe-4397-9dbb-9b2b20218538