[Editing] Introduce |EditCommandComposition::willUn/Reapply()| in prepare for 'beforeinput' (2/3)

third_party/WebKit/Source/core/editing/Editor.cpp

Index: third_party/WebKit/Source/core/editing/Editor.cpp
diff --git a/third_party/WebKit/Source/core/editing/Editor.cpp b/third_party/WebKit/Source/core/editing/Editor.cpp
index 8c1574d2f6b1515b416dc1e438d534daa00fa57d..2954891283900e17fad5cad4257946cc1f26294c 100644
--- a/third_party/WebKit/Source/core/editing/Editor.cpp
+++ b/third_party/WebKit/Source/core/editing/Editor.cpp
@@ -1257,18 +1257,16 @@ bool Editor::canUndo() {
   return m_undoStack->canUndo();
 }
 
-// TODO(chongz): Fire 'beforeinput' for user triggered undo.
-void Editor::undo(EditCommandSource) {
-  m_undoStack->undo();
+void Editor::undo(EditCommandSource source) {
+  m_undoStack->undo(source);
 }
 
 bool Editor::canRedo() {
   return m_undoStack->canRedo();
 }
 
-// TODO(chongz): Fire 'beforeinput' for user triggered redo.
-void Editor::redo(EditCommandSource) {
-  m_undoStack->redo();
+void Editor::redo(EditCommandSource source) {
+  m_undoStack->redo(source);
 }
 
 void Editor::setBaseWritingDirection(WritingDirection direction) {