Minimal implementation and tests of observable array methods

Minimal implementation and tests of observable array methods

Bail out of any special-casing in array methods.
Further optimization is possible, but can be left for later.

Committed: https://code.google.com/p/v8/source/detail?r=12917

[adamk, 2012-11-09 12:06:30]

https://codereview.chromium.org/11369151/diff/1/src/array.js
File src/array.js (right):

https://codereview.chromium.org/11369151/diff/1/src/array.js#newcode444
src/array.js:444: delete this[n];
This change is required for proper operation, and is the proper ordering per the
spec:

http://ecma-international.org/ecma-262/5.1/#sec-15.4.4.6

[rossberg, 2012-11-09 12:21:51]

LGTM