Bug 1350852 P2 - use mozvideoonlyseekcompleted to cancel throbber while resuming video decoder; r=jaws,jwwang

MozReview-Commit-ID: CV3LsfA6s1O

--HG--
extra : rebase_source : 8337aac3a3395b65a8ffca975c51b40666c12023

toolkit/content/widgets/videocontrols.xml

@@ -222,7 +222,7 @@
                     "playing", "waiting", "canplay", "canplaythrough",
                     "seeking", "seeked", "emptied", "loadedmetadata",
                     "error", "suspend", "stalled",
-                    "mozexitvideosuspend"],
+                    "mozexitvideosuspend", "mozvideoonlyseekcompleted"],
 
       showHours: false,
       firstFrameShown: false,
@@ -674,7 +674,6 @@
           case "seeked":
           case "playing":
           case "canplay":
-            this._cancelShowThrobberWhileResumingVideoDecoder();
           case "canplaythrough":
             this.setupStatusFader();
             break;
@@ -704,6 +703,10 @@
           case "mozexitvideosuspend":
             this._delayShowThrobberWhileResumingVideoDecoder();
             break;
+          case "mozvideoonlyseekcompleted":
+            this._cancelShowThrobberWhileResumingVideoDecoder();
+            this.setupStatusFader();
+            break;
           default:
             this.log("!!! event " + aEvent.type + " not handled!");
         }