Deprecate use of user gestures during scroll-related touch events

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

Index: third_party/WebKit/Source/core/input/TouchEventManager.h
diff --git a/third_party/WebKit/Source/core/input/TouchEventManager.h b/third_party/WebKit/Source/core/input/TouchEventManager.h
index da68249e5e07897db41b21fca2cbe65e93051a07..ef93f92567c8b39456974ee9ac90435c87be11f5 100644
--- a/third_party/WebKit/Source/core/input/TouchEventManager.h
+++ b/third_party/WebKit/Source/core/input/TouchEventManager.h
@@ -22,7 +22,7 @@ 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:
@@ -68,8 +68,13 @@ public:
     // Returns whether there is any touch on the screen.
     bool isAnyTouchActive() const;
 
-private:
+    // 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>&);
 
@@ -97,7 +102,10 @@ private:
     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