[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h

Index: third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h b/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h
index 81f9a4ee4c7860c1c65418456faad0a03916373b..882c87ad1aaddbedc38d18016a5273441cf52dc7 100644
--- a/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h
@@ -37,17 +37,20 @@ class CORE_EXPORT DeleteSelectionCommand final : public CompositeEditCommand {
  public:
   static DeleteSelectionCommand* create(
       Document& document,
+      CommandSource source,
       bool smartDelete = false,
       bool mergeBlocksAfterDelete = true,
       bool expandForSpecialElements = false,
       bool sanitizeMarkup = true,
       InputEvent::InputType inputType = InputEvent::InputType::None,
       const Position& referenceMovePosition = Position()) {
-    return new DeleteSelectionCommand(
-        document, smartDelete, mergeBlocksAfterDelete, expandForSpecialElements,
-        sanitizeMarkup, inputType, referenceMovePosition);
+    return new DeleteSelectionCommand(document, source, smartDelete,
+                                      mergeBlocksAfterDelete,
+                                      expandForSpecialElements, sanitizeMarkup,
+                                      inputType, referenceMovePosition);
   }
   static DeleteSelectionCommand* create(
+      CommandSource source,
       const VisibleSelection& selection,
       bool smartDelete = false,
       bool mergeBlocksAfterDelete = true,
@@ -55,7 +58,7 @@ class CORE_EXPORT DeleteSelectionCommand final : public CompositeEditCommand {
       bool sanitizeMarkup = true,
       InputEvent::InputType inputType = InputEvent::InputType::None) {
     return new DeleteSelectionCommand(
-        selection, smartDelete, mergeBlocksAfterDelete,
+        source, selection, smartDelete, mergeBlocksAfterDelete,
         expandForSpecialElements, sanitizeMarkup, inputType);
   }
 
@@ -63,13 +66,15 @@ class CORE_EXPORT DeleteSelectionCommand final : public CompositeEditCommand {
 
  private:
   DeleteSelectionCommand(Document&,
+                         CommandSource,
                          bool smartDelete,
                          bool mergeBlocksAfterDelete,
                          bool expandForSpecialElements,
                          bool santizeMarkup,
                          InputEvent::InputType,
                          const Position& referenceMovePosition);
-  DeleteSelectionCommand(const VisibleSelection&,
+  DeleteSelectionCommand(CommandSource,
+                         const VisibleSelection&,
                          bool smartDelete,
                          bool mergeBlocksAfterDelete,
                          bool expandForSpecialElements,