test/test262: update testcfg.py for new test262

testcfg.py:

- update revision and MD5
- remove non-mandatory harness files
- use test parser distributed with test262
- new attribute `suite.harnesspath`
- new method GetIncludesForTest
- GetSourceForTest: cache source on testcase
- IsNegativeTest: use parseTestRecord
- use 7-char sha hash [1]
- DRY setting up paths to test262 suite, harness, etc
- clean up helper fns

harness-adapter.js:

- add $DONE function to adapter [2]

1: github tar file has 7-char sha embedded in dir name
script cannot find directory to rename if they don't match exactly

2: test262 uses a `$DONE` function for async tests with
semantics like those of mocha's `done`.

Briefly: done(arg) => if (arg) { /* failure */ }

Implemented a version of this for v8, using v8-specific
api (`print`, `quit`)

BUG=v8:3513
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/478163002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23313 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove dependency on GCTrace from GCIdleTimeHandler.

This makes testing GCIdleTimeHandler easier.

BUG=
R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/496253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23314 ce2b1a6d-e550-0410-aec6-3dcde31c8c00