Bug 1286509 - Range input does not fire ‘change’ event when the range is changed using the keyboard. r=smaug

dom/html/HTMLInputElement.h

@@ -1494,6 +1494,12 @@ private:
            aType == NS_FORM_INPUT_NUMBER;
   }
 
+  /**
+   * Returns true if the key code may induce the input's value changed to fire
+   * a "change" event accordingly.
+   */
+  bool MayFireChangeOnKeyUp(uint32_t aKeyCode) const;
+
   struct nsFilePickerFilter {
     nsFilePickerFilter()
       : mFilterMask(0) {}