Revert of Refactor the selection code in EventHandler

Source/core/page/EventHandler.h

Index: Source/core/page/EventHandler.h
diff --git a/Source/core/page/EventHandler.h b/Source/core/page/EventHandler.h
index 1d2b47a7cb35c091864e2b1d66eb0c3901b521e3..a2314445140e2e5224e4b092500258fd976636db 100644
--- a/Source/core/page/EventHandler.h
+++ b/Source/core/page/EventHandler.h
@@ -27,6 +27,7 @@
 #define EventHandler_h
 
 #include "core/CoreExport.h"
+#include "core/editing/TextGranularity.h"
 #include "core/events/TextEventInputType.h"
 #include "core/layout/HitTestRequest.h"
 #include "core/style/ComputedStyleConstants.h"
@@ -75,11 +76,12 @@
 class ScrollableArea;
 class Scrollbar;
 class ScrollState;
-class SelectionController;
 class TextEvent;
+class VisibleSelection;
 class WheelEvent;
 class Widget;
 
+enum AppendTrailingWhitespace { ShouldAppendTrailingWhitespace, DontAppendTrailingWhitespace };
 enum class DragInitiator;
 
 class CORE_EXPORT EventHandler : public NoBaseWillBeGarbageCollectedFinalized<EventHandler> {
@@ -196,19 +198,30 @@
     PassRefPtr<UserGestureToken> takeLastMouseDownGestureToken() { return m_lastMouseDownUserGestureToken.release(); }
 
     int clickCount() { return m_clickCount; }
-
-    SelectionController& selectionController() const { return *m_selectionController; }
+    bool mouseDownWasSingleClickInSelection() { return m_mouseDownWasSingleClickInSelection; }
 
 private:
     static DragState& dragState();
 
     DataTransfer* createDraggingDataTransfer() const;
 
+    bool updateSelectionForMouseDownDispatchingSelectStart(Node*, const VisibleSelection&, TextGranularity);
+    void selectClosestWordFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestMisspellingFromHitTestResult(const HitTestResult&, AppendTrailingWhitespace);
+    void selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults&);
+    void selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults&);
+
     bool handleMouseMoveOrLeaveEvent(const PlatformMouseEvent&, HitTestResult* hoveredNode = nullptr, bool onlyUpdateScrollbars = false, bool forceLeave = false);
     bool handleMousePressEvent(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventSingleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventDoubleClick(const MouseEventWithHitTestResults&);
+    bool handleMousePressEventTripleClick(const MouseEventWithHitTestResults&);
     bool handleMouseFocus(const MouseEventWithHitTestResults&);
     bool handleMouseDraggedEvent(const MouseEventWithHitTestResults&);
     bool handleMouseReleaseEvent(const MouseEventWithHitTestResults&);
+
+    bool handlePasteGlobalSelection(const PlatformMouseEvent&);
 
     HitTestRequest::HitTestRequestType getHitTypeForGestureType(PlatformEvent::Type);
     void applyTouchAdjustment(PlatformGestureEvent*, HitTestResult*);
@@ -227,6 +240,8 @@
     void hoverTimerFired(Timer<EventHandler>*);
     void cursorUpdateTimerFired(Timer<EventHandler>*);
     void activeIntervalTimerFired(Timer<EventHandler>*);
+
+    bool mouseDownMayStartSelect() const { return m_mouseDownMayStartSelect; }
 
     void fakeMouseMoveEventTimerFired(Timer<EventHandler>*);
     void cancelFakeMouseMoveEvent();
@@ -290,6 +305,8 @@
     void defaultEscapeEventHandler(KeyboardEvent*);
     void defaultArrowEventHandler(WebFocusType, KeyboardEvent*);
 
+    void updateSelectionForMouseDrag(const HitTestResult&);
+
     void updateLastScrollbarUnderMouse(Scrollbar*, bool);
 
     void setFrameWasScrolledByUser();
@@ -321,8 +338,11 @@
     bool m_capturesDragging;
     RefPtrWillBeMember<Node> m_mousePressNode;
 
+    bool m_mouseDownMayStartSelect;
     bool m_mouseDownMayStartDrag;
-    const OwnPtrWillBeMember<SelectionController> m_selectionController;
+    bool m_mouseDownWasSingleClickInSelection;
+    enum SelectionInitiationState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };
+    SelectionInitiationState m_selectionInitiationState;
 
     LayoutPoint m_dragStartPos;