Deprecate use of user gestures during scroll-related touch events

third_party/WebKit/Source/core/input/TouchEventManager.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 TouchEventManager_h
 #define TouchEventManager_h
 
 #include "core/CoreExport.h"
 #include "core/events/PointerEventFactory.h"
 #include "platform/UserGestureIndicator.h"
 #include "public/platform/WebInputEventResult.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 
 
 namespace blink {
 
 class LocalFrame;
 class Document;
 class PlatformTouchEvent;
 class PointerEventWithTarget;
 
 // This class takes care of dispatching all touch events and
 // maintaining related states.
-class CORE_EXPORT TouchEventManager {
+class CORE_EXPORT TouchEventManager: public UserGestureUtilizedCallback {
     WTF_MAKE_NONCOPYABLE(TouchEventManager);
     DISALLOW_NEW();
 public:
     class TouchInfo {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     public:
         DEFINE_INLINE_TRACE()
         {
             visitor->trace(touchNode);
             visitor->trace(targetFrame);
@@ skipping 25 matching lines @@
     WebInputEventResult handleTouchEvent(
         const PlatformTouchEvent&,
         HeapVector<TouchInfo>&);
 
     // Resets the internal state of this object.
     void clear();
 
     // Returns whether there is any touch on the screen.
     bool isAnyTouchActive() const;
 
+    // Indicate that a touch scroll has started.
+    void setTouchScrollStarted() { m_touchScrollStarted = true; }
+
+    // Invoked when a UserGestureIndicator corresponding to a touch event is utilized.
+    void userGestureUtilized() override;
+
 private:
-
     void updateTargetAndRegionMapsForTouchStarts(HeapVector<TouchInfo>&);
     void setAllPropertiesOfTouchInfos(HeapVector<TouchInfo>&);
 
     WebInputEventResult dispatchTouchEvents(
         const PlatformTouchEvent&,
         const HeapVector<TouchInfo>&,
         bool allTouchesReleased);
 
 
     // NOTE: If adding a new field to this class please ensure that it is
     // cleared in |TouchEventManager::clear()|.
 
     const Member<LocalFrame> m_frame;
 
     // The target of each active touch point indexed by the touch ID.
     using TouchTargetMap = HeapHashMap<unsigned, Member<Node>, DefaultHash<unsigned>::Hash, WTF::UnsignedWithZeroKeyHashTraits<unsigned>>;
     TouchTargetMap m_targetForTouchID;
     using TouchRegionMap = HashMap<unsigned, String, DefaultHash<unsigned>::Hash, WTF::UnsignedWithZeroKeyHashTraits<unsigned>>;
     TouchRegionMap m_regionForTouchID;
 
     // If set, the document of the active touch sequence. Unset if no touch sequence active.
     Member<Document> m_touchSequenceDocument;
 
     RefPtr<UserGestureToken> m_touchSequenceUserGestureToken;
     bool m_touchPressed;
     // True if waiting on first touch move after a touch start.
     bool m_waitingForFirstTouchMove;
-
+    // True if a touch is active but scrolling/zooming has started.
+    bool m_touchScrollStarted;
+    // The touch event currently being handled or NoType if none.
+    PlatformEvent::EventType m_currentEvent;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::TouchEventManager::TouchInfo);
 
 #endif // TouchEventManager_h