Scroll Customization Prototype (Not for review, WIP)

Source/platform/PlatformGestureEvent.h

Index: Source/platform/PlatformGestureEvent.h
diff --git a/Source/platform/PlatformGestureEvent.h b/Source/platform/PlatformGestureEvent.h
index 2b5fb8f66468229be02b403ef5cbd6db565832b1..596cc1c0dec98878cc8f0c051c81af98aeed5dce 100644
--- a/Source/platform/PlatformGestureEvent.h
+++ b/Source/platform/PlatformGestureEvent.h
@@ -43,7 +43,7 @@ public:
         memset(&m_data, 0, sizeof(m_data));
     }
 
-    PlatformGestureEvent(Type type, const IntPoint& position, const IntPoint& globalPosition, const IntSize& area, double timestamp, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey, float deltaX, float deltaY, float velocityX, float velocityY, bool preventPropagation)
+    PlatformGestureEvent(Type type, const IntPoint& position, const IntPoint& globalPosition, const IntSize& area, double timestamp, bool shiftKey, bool ctrlKey, bool altKey, bool metaKey, float deltaX, float deltaY, float velocityX, float velocityY, bool inertial, bool preventPropagation)
         : PlatformEvent(type, shiftKey, ctrlKey, altKey, metaKey, timestamp)
         , m_position(position)
         , m_globalPosition(globalPosition)
@@ -53,11 +53,12 @@ public:
         if (type == PlatformEvent::GestureScrollBegin
             || type == PlatformEvent::GestureScrollEnd
             || type == PlatformEvent::GestureScrollUpdate) {
-            m_data.m_scrollUpdate.m_deltaX = deltaX;
-            m_data.m_scrollUpdate.m_deltaY = deltaY;
-            m_data.m_scrollUpdate.m_velocityX = velocityX;
-            m_data.m_scrollUpdate.m_velocityY = velocityY;
-            m_data.m_scrollUpdate.m_preventPropagation = preventPropagation;
+            m_data.m_scroll.m_deltaX = deltaX;
+            m_data.m_scroll.m_deltaY = deltaY;
+            m_data.m_scroll.m_velocityX = velocityX;
+            m_data.m_scroll.m_velocityY = velocityY;
+            m_data.m_scroll.m_inertial = inertial;
+            m_data.m_scroll.m_preventPropagation = preventPropagation;
         }
     }
 
@@ -68,14 +69,16 @@ public:
 
     float deltaX() const
     {
-        ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
-        return m_data.m_scrollUpdate.m_deltaX;
+        ASSERT(m_type == PlatformEvent::GestureScrollUpdate
+            || m_type == PlatformEvent::GestureScrollEnd);
+        return m_data.m_scroll.m_deltaX;
     }
 
     float deltaY() const
     {
-        ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
-        return m_data.m_scrollUpdate.m_deltaY;
+        ASSERT(m_type == PlatformEvent::GestureScrollUpdate
+            || m_type == PlatformEvent::GestureScrollEnd);
+        return m_data.m_scroll.m_deltaY;
     }
 
     int tapCount() const
@@ -86,20 +89,29 @@ public:
 
     float velocityX() const
     {
-        ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
-        return m_data.m_scrollUpdate.m_velocityX;
+        ASSERT(m_type == PlatformEvent::GestureScrollUpdate
+            || m_type == PlatformEvent::GestureScrollEnd);
+        return m_data.m_scroll.m_velocityX;
     }
 
     float velocityY() const
     {
-        ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
-        return m_data.m_scrollUpdate.m_velocityY;
+        ASSERT(m_type == PlatformEvent::GestureScrollUpdate
+            || m_type == PlatformEvent::GestureScrollEnd);
+        return m_data.m_scroll.m_velocityY;
+    }
+
+    bool inertial() const
+    {
+        ASSERT(m_type == PlatformEvent::GestureScrollUpdate
+            || m_type == PlatformEvent::GestureScrollEnd);
+        return m_data.m_scroll.m_inertial;
     }
 
     bool preventPropagation() const
     {
         ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
-        return m_data.m_scrollUpdate.m_preventPropagation;
+        return m_data.m_scroll.m_preventPropagation;
     }
 
     float scale() const
@@ -160,7 +172,8 @@ protected:
             float m_velocityX;
             float m_velocityY;
             int m_preventPropagation;
-        } m_scrollUpdate;
+            bool m_inertial;
+        } m_scroll;
 
         struct {
             float m_scale;