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This CL starts preparing popup handlers for changes to either line
index or line state, instead of only considering line and assuming
the NORMAL state. The interface is changed, but not behavior.

Bug: 1046523
Change-Id: I1cdf5e288b6be2c488795be2bfba0b276327326e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132769Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Auto-Submit: Orin Jaworski <orinj@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756122}