Tweak and repurpose code caching options.
Tweak and repurpose code caching options.

- Removed lower and upper source size limit for code caching.
- *Small and *Mobile options turn on compression.
- HeuristicsDefault* options cache on first occurrence.
- Recent* options cache on second occurrence within 36 hours.
- Heuristics* options cache on second occurrence within 72 hours.
- Added V8.CodeCacheSizeRatio histogram to track code cache overhead.

BUG=chromium:399580

Review URL: https://codereview.chromium.org/869513005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189511 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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