Bug 1011059 - Use editor rather than selection controller to select all; r=margaret

mobile/android/chrome/content/SelectionHandler.js

@@ -401,7 +401,12 @@ var SelectionHandler = {
     }
 
     // Else default to selectALL Document
-    this._getSelectionController().selectAll();
+    let editor = this._getEditor();
+    if (editor) {
+      editor.selectAll();
+    } else {
+      this._getSelectionController().selectAll();
+    }
 
     // Selection is entire HTMLHtmlElement, remove any trailing document whitespace
     let selection = this._getSelection();
@@ -712,6 +717,17 @@ var SelectionHandler = {
     return selection.toString().trim();
   },
 
+  _getEditor: function sh_getEditor() {
+    if (this._targetElement instanceof Ci.nsIDOMNSEditableElement) {
+      return this._targetElement.QueryInterface(Ci.nsIDOMNSEditableElement).editor;
+    }
+    return this._contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIWebNavigation)
+                              .QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIEditingSession)
+                              .getEditorForWindow(this._contentWindow);
+  },
+
   _getSelectionController: function sh_getSelectionController() {
     if (this._targetElement instanceof Ci.nsIDOMNSEditableElement)
       return this._targetElement.QueryInterface(Ci.nsIDOMNSEditableElement).editor.selectionController;