Introduce InsertIncrementalTextCommand to respect existing style for composition

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 c1d7b1601c31f25d33007acffabad03502910b9f..67cf663cd638fb1de63f51a51ecaf3786b596704 100644
--- a/third_party/WebKit/Source/core/editing/Editor.cpp
+++ b/third_party/WebKit/Source/core/editing/Editor.cpp
@@ -207,6 +207,11 @@ bool Editor::handleTextEvent(TextEvent* event) {
   if (event->isDrop())
     return false;
 
+  // Default event handling for IncrementalInsertion will be handled by
+  // TypingCommand::insertText(), so we leave the event for it.
+  if (event->isIncrementalInsertion())
+    return false;
+
   // TODO(xiaochengh): The use of updateStyleAndLayoutIgnorePendingStylesheets
   // needs to be audited.  See http://crbug.com/590369 for more details.
   m_frame->document()->updateStyleAndLayoutIgnorePendingStylesheets();