Bug 777450 - Part 2: Long pressing a Flash video no longer activates text selection. r=wesj

mobile/android/chrome/content/browser.js

@@ -1388,8 +1388,7 @@ var NativeWindow = {
                              0, null);
         rootElement.ownerDocument.defaultView.addEventListener("contextmenu", this, false);
         rootElement.dispatchEvent(event);
-      } else {
-        // Otherwise, let the selection handler take over
+      } else if (SelectionHandler.canSelect(rootElement)) {
         SelectionHandler.startSelection(rootElement, aX, aY);
       }
     },
@@ -1643,6 +1642,14 @@ var SelectionHandler = {
     this._ignoreCollapsedSelection = false;
   },
 
+  /** Returns true if the provided element can be selected in text selection, false otherwise. */
+  canSelect: function sh_canSelect(aElement) {
+    return !(aElement instanceof Ci.nsIDOMHTMLButtonElement ||
+             aElement instanceof Ci.nsIDOMHTMLEmbedElement ||
+             aElement instanceof Ci.nsIDOMHTMLImageElement ||
+             aElement instanceof Ci.nsIDOMHTMLMediaElement);
+  },
+
   // aX/aY are in top-level window browser coordinates
   startSelection: function sh_startSelection(aElement, aX, aY) {
     // Clear out any existing selection