[DevTools] Add tooltips to network request detail tabs
[DevTools] Add tooltips to network request detail tabs

Bug: 800768
Change-Id: I74d13257cd37821f3d75c14a168ccc403e559a32
Reviewed-on: https://chromium-review.googlesource.com/c/1342765
Commit-Queue: Joey Arhar <b82f612a3ddcfbac27d1758ce0a3eba47bee1116@chromium.org>
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#610710}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b31ed377b1a804d269818b08f3ddabe8d05c1b8c
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