Summary:
Introduced a highlight manager, which prevents drilling the highlight through the entire component tree and causing too many re-renders.
Also smartly optimizes that non-matched highlighted text doesn't render unnecessarily, and debounces the updates.
Finally, automatically scroll to the first highlight.
Reviewed By: jknoxville
Differential Revision: D21348575
fbshipit-source-id: 71f7ba2e981ad3fc1ea7f5e7043645e6b6811fb7
fdff6aeae0