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This enables code caching for <script> tags whose source code is embedded
in the HTML. External scripts store their cached code on metadata
associated with the external script resource; now, inline scripts store
their cached code on metadata associated with the HTML document's
RawResource.

To allow multiple inline scripts per HTML page, the RawResource metadata
can hold multiple code caches. These are keyed by the SHA-256 hash of the
script's source, which is a large enough hash that we don't have to worry
about collisions, and thus don't have to store the script's source in the
cache.

The multi-script metadata has a simple serialization format optimized for
easy serialize/deserialize:

    marker (uint32)
    num_entries (int)
    key 1 (Key type)
    len data 1 (size_t)
    type data 1
    data for key 1
    ...
    key N (Key type)
    len data N (size_t)
    type data N
    data for key N

Inline scripts receive a CachedMetadataHandler implementation which is a
view onto this multi-script handler.

Bug: chromium:823663
Change-Id: Ib14edfaf460aa8bfc90cfe12b8a6b4b7af050de7
Reviewed-on: https://chromium-review.googlesource.com/893401
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547671}