Notify all coverage listeners when coverage data is available

Since coverage data can be provided asynchronously
and the diff rendering won't wait for it. So its neccessary
to notify all listeners once data coming back.

Change-Id: I19625d6c53ad15491c3ec6f508a4bc076334e015
(cherry picked from commit d512905e6c5dcc285e8272735ce0d45d9120b778)
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index aa69248..1c36745 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -366,7 +366,7 @@
               coverage-ranges="[[coverageRanges]]"
               project-name="[[projectName]]"
               diff="[[diff]]"
-              diff-path="[[path]]"
+              path="[[path]]"
               change-num="[[changeNum]]"
               patch-num="[[patchRange.patchNum]]"
               view-mode="[[viewMode]]"