Becky Siegel d7dbed640c Add a diff preference for font size
This change adds a font size field in diff preferences in both the
generic preferences page and also the preferences modal from the diff
view. The new field allows users to update their preferred font size
for the diff view to be displayed. This updates both the line number
font size as well as the diff font size.

Feature: Issue 4417
Change-Id: I0fb75fd2186d2ff63b3627e8b0f15f2b3cddbfa3
2016-10-12 16:31:24 -07:00
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