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This adds a bunch of missing values to the "DevToolsPanel" enum, as
otherwise all these drawers get logged with the code 0 instead, which
makes it impossible to distinguish.

Bug: chromium:993562
Change-Id: Icdb11f6c35fe8f521e141c487c6a0b483fa4ee3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805663
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697206}