firefox-devtools / firefox-devtools/profiler

Add a tooltip to see long marker names in the Marker Chart

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markers polish
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Description

For https://bugzilla.mozilla.org/show_bug.cgi?id=1650336, we want to differentiate markers originating from different WebConsole UIs by adding an ID unique to a given WebConsole.

This allows us to see markers for each WebConsole UI on separate lines in the MarkerChart tab.
But it makes for really long marker labels, eg `WebconsoleAddMessages (server1.conn0.parentProcessTarget2)`.

In the MarkerChart sidebar, they are rendered with an ellipsis:
![image](https://user-images.githubusercontent.com/1141550/86952618-8f5e7500-c153-11ea-8a8a-ad051d7f8659.png)

(profile at: https://share.firefox.dev/2Z7Qroq)

It would be great if hovering on the marker's label would show a tooltip revealing the complete name.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-285)

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