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This allows ContentVerifier::ShouldVerifyAnyPaths to compare
relative paths against indexed ruleset's relative path in future. This
will obviate the need to construct full path (which can be tricky some
times). Note that this will be done in a follow up.

Bug: 796395
Test: No behavior changes expected.
Change-Id: I05febe27eb52c2c823e6e609f1be6d9803b471bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071335Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744287}