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This CL hooks the new Disabled Sites code in components into the iOS
Shared Highlighting flow. It also adds a new flag which is used in the
process.

Other platforms can reuse the same flag, but it is not yet exposed via
chrome://flags on those platforms and would need to be added.

Bug: 1157981
Change-Id: I9d84fc4c04fe06fd8e806a98b9ff57bd3f743667
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626207
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843165}