GitLab

- Adds new net::CacheType values so the JS code cache can be distinguished
  from the WASM code cache. GENERATED_BYTE_CODE_CACHE refers to Javascript,
  GENERATED_NATIVE_CODE_CACHE refers to WebAssembly.
- Changes SimpleBackendImpl::MaxFileSize to allow PNACL and WASM cache
  entries to take up to 1/2 of the cache. The previous limit was 1/8 of
  the cache.

This CL makes it possible for apps with large WASM modules (150 MB) to
benefit from code caching on desktop. The limit of 1/2 the cache size is
somewhat conservative. PNACL entries are also native code and can occupy
the entire cache (see BackEndImpl::MaxFileSize).

Bug: chromium:719172
Change-Id: Id177862f00c138034d43a5256d317928a48aa467
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636648Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665925}