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* Implement the fuchsia.web.Frame/SetUrlRequestRewriteRules API.
* Add a mojo interface to provide the renderers with new rules.
  * This interface is implemented in the browser in
    UrlRequestRewriteRulesManager, which also takes care of validating
    and converting the rules from FIDL to Mojo, and providing them to
    the WebEngineURLLoaderThrottles in the browser.
  * In the renderer, there is one rules receiver per RenderFrame,
    implemented in UrlRequestRulesReceiver. They cache the rules and
    provide them to the WebEngineURLLoaderThrottles in the renderer.
* Add unit tests and browser tests for the new API.

Bug: 976975
Change-Id: I446ea4838d50e65c568e7e2cbcd32c23d64af426
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1659677
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695298}