Introducing WebCoalescedInputEvent and inclusion in content/common

third_party/WebKit/public/platform/WebCoalescedInputEvent.h

+// 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.
+
+#ifndef WebCoalescedInputEvent_h
+#define WebCoalescedInputEvent_h
+
+#include "WebCommon.h"
+#include "WebInputEvent.h"
+
+#include <memory>
+#include <vector>
+
+namespace blink {
+
+struct BLINK_COMMON_EXPORT WebInputEventDeleter {
+  void operator()(blink::WebInputEvent*) const;
+};
+
+using WebScopedInputEvent =
+    std::unique_ptr<WebInputEvent, WebInputEventDeleter>;
+
+// This class is representing a polymorphic WebInputEvent structure with its
+// coalesced events. The event could be any events defined in WebInputEvent.h.
+class BLINK_COMMON_EXPORT WebCoalescedInputEvent {
+ public:
+  WebCoalescedInputEvent(WebScopedInputEvent);
+  WebCoalescedInputEvent(const WebInputEvent&);
+  WebCoalescedInputEvent(const WebInputEvent&,
+                         const std::vector<const WebInputEvent*>&);
+
+  WebInputEvent* eventPointer();
+  void addCoalescedEvent(const blink::WebInputEvent&);
+  const WebInputEvent& event() const;
+  size_t coalescedEventSize() const;
+  const WebInputEvent* coalescedEvent(int index) const;
+  std::vector<const WebInputEvent*> getCoalescedEventsPointers() const;
+
+ private:
+  WebScopedInputEvent m_event;
+  std::vector<WebScopedInputEvent> m_coalescedEvents;
+};
+
+using WebScopedCoalescedInputEvent = std::unique_ptr<WebCoalescedInputEvent>;
+
+}  // namespace blink
+
+#endif