Measure usage for Selection.setPosition

Selection.setPosition was there from the very beginning:
http://src.chromium.org/viewvc/blink/trunk/WebCore/bindings/js/kjs_window.cpp?r1=6266&r2=6314&pathrev=24000

Currently it is just an alias of Selection.collapse function.
The setPosition function is a non standard function and both IE11 and FireFox don't support the function.
We should add a deprecation warning. 
Usage statistics would allow us to determine if it can be deprecated.

BUG=361002

Review URL: https://codereview.chromium.org/227493002

git-svn-id: svn://svn.chromium.org/blink/trunk@171035 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Hook up gin platform to blink, and explicitly manage the main thread isolate

We'll soon get rid of the v8 default isolate, so we'll need to manage
our own.

To test the platform implementation, run with
  --js-flags="--noparallel_sweeping --concurrent-sweeping --job-based-sweeping"

BUG=359977
R=dcarney@chromium.org,haraken@chromium.org

Review URL: https://codereview.chromium.org/227653002

git-svn-id: svn://svn.chromium.org/blink/trunk@171036 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark virtual/gpu/fast/canvas/canvas-lost-gpu-context.html as crashing in debug mode

BUG=327698
TBR=jianli@chromium.org

Review URL: https://codereview.chromium.org/228273002

git-svn-id: svn://svn.chromium.org/blink/trunk@171037 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add virtual dtor to SVGZoomAndPan

Quiets a warning on g++ 4.7.3, per request of Sigbjørn:
https://codereview.chromium.org/227043008/#msg9

(virtual functions but non-virtual dtor in derived class)

NOTRY=true
NOTREECHECK=true

Review URL: https://codereview.chromium.org/226963004

git-svn-id: svn://svn.chromium.org/blink/trunk@171038 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [Elements] Do not update sidebar if frame resize event arrives during styles editing

This is regression from r163004.

R=pfeldman, vsevik
BUG=359853

Review URL: https://codereview.chromium.org/227463003

git-svn-id: svn://svn.chromium.org/blink/trunk@171039 bbb929c8-8fbe-4397-9dbb-9b2b20218538