Becky Siegel eb4ea184f7 Keyboard shortcuts to expand and collapse all comments
This change adds keyboard shortcuts to the "gr-diff-comment-thread"
expand all comments when 'e' is pressed and collapse all comments when
'shift + e' is pressed. Note that the keyboard event is detected on the
thread instead of the comment to minimize the number of events getting
triggered.

Feature: Issue 4738
Change-Id: Iab77349bd1527d7af5e05a827919a78a86909835
2016-10-12 11:13:56 -07:00
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