Set plugin focus by implementing HTMLPlugInElement::SetFocused.

third_party/WebKit/Source/core/html/shadow/DateTimeFieldElement.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 113 matching lines @@
     return;
   }
 
   if (key == "Backspace" || key == "Delete") {
     keyboard_event->SetDefaultHandled();
     SetEmptyValue(kDispatchEvent);
     return;
   }
 }
 
-void DateTimeFieldElement::SetFocused(bool value) {
-  if (field_owner_)
-    value ? field_owner_->DidFocusOnField() : field_owner_->DidBlurFromField();
-  ContainerNode::SetFocused(value);
+void DateTimeFieldElement::SetFocused(bool value, WebFocusType focus_type) {
+  if (field_owner_) {
+    if (value) {
+      field_owner_->DidFocusOnField(focus_type);
+    } else {
+      field_owner_->DidBlurFromField(focus_type);
+    }
+  }
+
+  ContainerNode::SetFocused(value, focus_type);
 }
 
 void DateTimeFieldElement::FocusOnNextField() {
   if (!field_owner_)
     return;
   field_owner_->FocusOnNextField(*this);
 }
 
 void DateTimeFieldElement::Initialize(const AtomicString& pseudo,
                                       const String& ax_help_text,
@@ skipping 71 matching lines @@
 
   if (event_behavior == kDispatchEvent && field_owner_)
     field_owner_->FieldValueChanged();
 }
 
 int DateTimeFieldElement::ValueForARIAValueNow() const {
   return ValueAsInteger();
 }
 
 }  // namespace blink