DevTools: display selected css style properties in the inspect element mode.
DevTools: display selected css style properties in the inspect element mode.

Change-Id: I3cc2ff2dfc4575bb58511849f3527d2c6ff653ff
Reviewed-on: https://chromium-review.googlesource.com/c/1401680
Commit-Queue: Pavel Feldman <e1161d7019a0d5c7981e3c3ffc69c76f4b09679a@chromium.org>
Reviewed-by: Erik Luo <26192f5e05d23e5ee959014fb911d780e566545b@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#621421}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 78baa033b60f79de21d387ada6c92e166d7441d3
ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend