Extract more of the mouse logic from EventHandler

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

Index: third_party/WebKit/Source/core/input/GestureManager.h
diff --git a/third_party/WebKit/Source/core/input/GestureManager.h b/third_party/WebKit/Source/core/input/GestureManager.h
index 1ddc143f4fcaef2c6e82cd4dfa3b4d1aec129451..4ac271962c810b9d71b7d465dc3e6fa356ed2a30 100644
--- a/third_party/WebKit/Source/core/input/GestureManager.h
+++ b/third_party/WebKit/Source/core/input/GestureManager.h
@@ -17,6 +17,7 @@ namespace blink {
 class ScrollManager;
 class SelectionController;
 class PointerEventManager;
+class MouseEventManager;
 
 // This class takes care of gestures and delegating the action based on the
 // gesture to the responsible class.
@@ -27,6 +28,7 @@ class CORE_EXPORT GestureManager
  public:
   GestureManager(LocalFrame*,
                  ScrollManager*,
+                 MouseEventManager*,
                  PointerEventManager*,
                  SelectionController*);
   DECLARE_TRACE();
@@ -66,6 +68,7 @@ class CORE_EXPORT GestureManager
   const Member<LocalFrame> m_frame;
 
   Member<ScrollManager> m_scrollManager;
+  Member<MouseEventManager> m_mouseEventManager;
   Member<PointerEventManager> m_pointerEventManager;
 
   // Set on GestureTapDown if the |pointerdown| event corresponding to the