Bug 1292133 - Add contextmenu tunnelling for inspect element. r=ochameau

MozReview-Commit-ID: Lu08M6xgo3R

--HG--
extra : rebase_source : 09eeaa0edae0b2fd8350070dc3b0eba923784aea

devtools/client/responsive.html/browser/tunnel.js

@@ -340,6 +340,8 @@ MessageManagerTunnel.prototype = {
     "Forms:HideDropDown",
     "InPermitUnload",
     "PermitUnload",
+    // Messages sent to tabbrowser.xml
+    "contextmenu",
     // Messages sent to SelectParentHelper.jsm
     "Forms:UpdateDropDown",
     // Messages sent to browser.js