DevTools: do not highlight padding/margin/border while editing it.
DevTools: do not highlight padding/margin/border while editing it.

Only highlight on hover, clear the highlight once editing starts.

Bug: 935687
Change-Id: I25fe10be549a5c0c37d08aba62688c3472c66354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1501212
Reviewed-by: Erik Luo <26192f5e05d23e5ee959014fb911d780e566545b@chromium.org>
Commit-Queue: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#637556}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c64725a18d299b917ae2297b4d5adeef0778bcd6
ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend