Fix bars shown to the right from the x-axis end (#3422)
Fix bars shown to the right from the x-axis end (#3422)

If the min value of histogram is not zero,
the width of the histogram was calculated incorrectly.
This in turn led to the incorrect width of bars.
The commit fixes that.

Tests: Manual
Bug: http://b/224734060
google/orbit,google/orbit,google/orbit,google/orbit