DevTools: Prevents submenu from hiding when user clicks on scrollbar
DevTools: Prevents submenu from hiding when user clicks on scrollbar

Bug: 870191
Change-Id: I7a9586359e3c0cae2ecea1a1cbfedc238d7a8cbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774452
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>
Commit-Queue: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#698017}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 36e411a535e667f8ba617ce96bd8f1ac225f1b02

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend