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This patch extends WebLayer to package and index the subresource
filter's unindexed ruleset data that is currently pulled into the tree
at gclient sync. To do so it does the following:

- Packages that data and its manifest as compressed resources in the
  app
- Has WebLayer kick off indexing as part of startup, using the
  subresource filter component's recently-added ability to read the
  unindexed ruleset data from a resource in the ResourceBundle and
  obtaining the version of the data from the manifest

We note the following:
- The compressed unindexed data is ~70 KB. The uncompressed data is ~300
  KB. Both of these will slowly grow over time.
- RulesetService short-circuits out of indexing the data if the content
  version has not changed from that of the last-indexed version
  (saved in prefs), so this operation will have an impact on startup
  only when the unindexed ruleset data changes (which will happen at
  maximum only once with every weblayer app update, and in practice
  presumably less often than that). Nonetheless, to limit impact on
  startup in that case we post the indexing as a BEST_EFFORT task from
  the startup flow. BEST_EFFORT tasks are guaranteed to executee in a
  reasonable delay assuming that the app isn't closed.

At this point in time Chrome is continuing to use the component updater;
using of the in-tree subresource filter data is done *only* by
WebLayer.

Bug: 1116095
Binary-Size: 40K increase due to packaging compressed ruleset data
Change-Id: Ifeffd6d8fcd223a9783020a97e246dafc69c4276
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469562Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825333}