Changes to mini timeline drawer implementation.

Remove timeline "ruler" to free up space.
Stack timelines from bottom up and decrease each timeline's thickness, in preparation for drawing all traces in mini timeline.
Some changes to the MiniTimelineDrawer interface to replace use of "get property()" with "getProperty()" for consistency with codebase.

Bug: 305123193
Test: npm run test:unit:ci
Change-Id: I4fba980906f17dfeb63d039ea9dceb51ed80d8e8
4 files changed