Implement <select> Popup Menu using PagePopup

Source/web/PopupMenuImpl.h

Index: Source/web/PopupMenuImpl.h
diff --git a/Source/web/PopupMenuImpl.h b/Source/web/PopupMenuImpl.h
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+// Copyright (c) 2014 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.
+
+#ifndef PopupMenuImpl_h
+#define PopupMenuImpl_h
+
+#include "core/html/forms/PopupMenuClient.h"
+#include "core/page/PagePopupClient.h"
+#include "platform/PopupMenu.h"
+
+namespace blink {
+
+class ChromeClientImpl;
+class PagePopup;
+class HTMLElement;
+class HTMLHRElement;
+class HTMLOptGroupElement;
+class HTMLOptionElement;
+
+class PopupMenuImpl final : public PopupMenu, public PagePopupClient {
+public:
+    static PassRefPtrWillBeRawPtr<PopupMenuImpl> create(ChromeClientImpl*, PopupMenuClient*);
+    virtual ~PopupMenuImpl();
+
+    void dispose();
+
+private:
+    PopupMenuImpl(ChromeClientImpl*, PopupMenuClient*);
+
+    void addOption(HTMLOptionElement&, SharedBuffer*);
+    void addOptGroup(HTMLOptGroupElement&, SharedBuffer*);
+    void addSeparator(HTMLHRElement&, SharedBuffer*);
+    void addElementStyle(HTMLElement&, SharedBuffer*);
+
+    // PopupMenu functions:
+    void show(const FloatQuad& controlPosition, const IntSize& controlSize, int index) override;
+    void hide() override;
+    void updateFromElement() override;
+    void disconnectClient() override;
+
+    // PagePopupClient functions:
+    IntSize contentSize() override;
+    void writeDocument(SharedBuffer*) override;
+    void didWriteDocument(Document&) override;
+    void setValueAndClosePopup(int, const String&) override;
+    void setValue(const String&) override;
+    void closePopup() override;
+    Element& ownerElement() override;
+    Locale& locale() override;
+    void didClosePopup() override;
+
+    ChromeClientImpl* m_chromeClient;
+    PopupMenuClient* m_client;
+    PagePopup* m_popup;
+    // If >= 0, this is the index we should accept when the popup closes.
+    // This is used for keyboard navigation, where we want the
+    // text to change immediately but set the value on close.
+    int m_indexToSetOnClose;
+};
+
+}
+
+#endif // PopupMenuImpl_h