Bug 1274104 part 1 - Allow mochitest main document to request fullscreen. r=jmaher

MozReview-Commit-ID: 4x40C0yGGKR

--HG--
extra : source : 92b3d49fd9af8bc88b37d7ee0278899548870bc9

testing/mochitest/server.js

@@ -712,7 +712,7 @@ function testListing(metadata, response)
           ),
           DIV({class: "clear"}),
           DIV({class: "frameholder"},
-            IFRAME({scrolling: "no", id: "testframe"})
+            IFRAME({scrolling: "no", id: "testframe", "allowfullscreen": true})
           ),
           DIV({class: "clear"}),
           DIV({class: "toggle"},