[InputEvent] Support |deleteByDrag|, |insertFromDrop| and fire in sequential order

third_party/WebKit/Source/core/editing/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("editing") {
   split_count = 5
   sources = [
     "CaretBase.cpp",
@@ skipping 60 matching lines @@
     "commands/BreakBlockquoteCommand.cpp",
     "commands/BreakBlockquoteCommand.h",
     "commands/CompositeEditCommand.cpp",
     "commands/CompositeEditCommand.h",
     "commands/CreateLinkCommand.cpp",
     "commands/CreateLinkCommand.h",
     "commands/DeleteFromTextNodeCommand.cpp",
     "commands/DeleteFromTextNodeCommand.h",
     "commands/DeleteSelectionCommand.cpp",
     "commands/DeleteSelectionCommand.h",
+    "commands/DragAndDropCommand.cpp",
+    "commands/DragAndDropCommand.h",
     "commands/EditCommand.cpp",
     "commands/EditCommand.h",
     "commands/EditingState.cpp",
     "commands/EditingState.h",
     "commands/EditorCommand.cpp",
     "commands/FormatBlockCommand.cpp",
     "commands/FormatBlockCommand.h",
     "commands/IndentOutdentCommand.cpp",
     "commands/IndentOutdentCommand.h",
     "commands/InsertIntoTextNodeCommand.cpp",
@@ skipping 102 matching lines @@
 
   if (is_mac) {
     sources += [ "commands/SmartReplaceCF.cpp" ]
   }
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }