Create MouseEventManager and EventHandlingUtil

third_party/WebKit/Source/core/input/BoundaryEventDispatcher.h

Index: third_party/WebKit/Source/core/input/BoundaryEventDispatcher.h
diff --git a/third_party/WebKit/Source/core/input/BoundaryEventDispatcher.h b/third_party/WebKit/Source/core/input/BoundaryEventDispatcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..85b62da72e2b8e6549eaf5ecae50a8f6fcb9f984
--- /dev/null
+++ b/third_party/WebKit/Source/core/input/BoundaryEventDispatcher.h
@@ -0,0 +1,36 @@
+// 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 BoundaryEventDispatcher_h
+#define BoundaryEventDispatcher_h
+
+#include "core/events/EventTarget.h"
+
+namespace blink {
+
+// This class contains the common logic of finding related node in a boundary
+// crossing action and sending boundary events. The subclasses of this class
+// must define what events should be sent in every case.
+class BoundaryEventDispatcher {
+    STACK_ALLOCATED()
+public:
+    BoundaryEventDispatcher() {}
+    virtual ~BoundaryEventDispatcher() {}
+
+    void sendBoundaryEvents(
+        EventTarget* exitedTarget,
+        EventTarget* enteredTarget);
+
+protected:
+    virtual void dispatchOut(EventTarget*, EventTarget* relatedTarget) = 0;
+    virtual void dispatchOver(EventTarget*, EventTarget* relatedTarget) = 0;
+    virtual void dispatchLeave(EventTarget*, EventTarget* relatedTarget, bool checkForListener) = 0;
+    virtual void dispatchEnter(EventTarget*, EventTarget* relatedTarget, bool checkForListener) = 0;
+    virtual AtomicString getLeaveEvent() = 0;
+    virtual AtomicString getEnterEvent() = 0;
+};
+
+} // namespace blink
+
+#endif // BoundaryEventDispatcher_h