Rename V8WindowShell to WindowProxy

V8WindowShell is an implementation of "WindowProxy" in the spec
(http://www.w3.org/TR/2009/WD-html5-20090423/browsers.html#windowproxy).
We should rename it accordingly.

Review URL: https://codereview.chromium.org/451013003

git-svn-id: svn://svn.chromium.org/blink/trunk@180146 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: make r180096's FIXME comment accurate.

The underlying cause described in r180096 wasn't correct; update the
FIXME comment to make it more accurate.

R=haraken
BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/461373002

git-svn-id: svn://svn.chromium.org/blink/trunk@180147 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Make GC button in timeline to fire gc events in all targets

BUG=

Review URL: https://codereview.chromium.org/457523004

git-svn-id: svn://svn.chromium.org/blink/trunk@180148 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: fix (release) builds after r180088.

R=haraken
BUG=340522
NOTRY=true

Review URL: https://codereview.chromium.org/469713002

git-svn-id: svn://svn.chromium.org/blink/trunk@180149 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Animations: Make perf tests for web animations animate properly.

Web Animations uses ms for duration, while legacy keyframe animations uses sec
for duration. Currently, the given perf tests use sec, so animations are weird.

BUG=309981

Review URL: https://codereview.chromium.org/433423003

git-svn-id: svn://svn.chromium.org/blink/trunk@180150 bbb929c8-8fbe-4397-9dbb-9b2b20218538