Scroll Customization Prototype (Not for review, WIP)

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 5312dcdbdfd33254c2ee3bda5d186fc542e7e017..60316bd510b820d429b220340cc748edf3f648f6 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -653,18 +653,22 @@ bool WebViewImpl::scrollBy(const WebFloatSize& delta, const WebFloatSize& veloci
         if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
             return handleMouseWheel(*m_page->deprecatedLocalMainFrame(), syntheticWheel);
     } else {
+        m_lastScrollVelocity = velocity;
         WebGestureEvent syntheticGestureEvent;
 
         syntheticGestureEvent.type = WebInputEvent::GestureScrollUpdate;
         syntheticGestureEvent.data.scrollUpdate.preventPropagation = true;
         syntheticGestureEvent.data.scrollUpdate.deltaX = delta.width;
         syntheticGestureEvent.data.scrollUpdate.deltaY = delta.height;
+        syntheticGestureEvent.data.scrollUpdate.velocityX = velocity.width;
+        syntheticGestureEvent.data.scrollUpdate.velocityY = velocity.height;
         syntheticGestureEvent.x = m_positionOnFlingStart.x;
         syntheticGestureEvent.y = m_positionOnFlingStart.y;
         syntheticGestureEvent.globalX = m_globalPositionOnFlingStart.x;
         syntheticGestureEvent.globalY = m_globalPositionOnFlingStart.y;
         syntheticGestureEvent.modifiers = m_flingModifier;
         syntheticGestureEvent.sourceDevice = WebGestureDeviceTouchscreen;
+        syntheticGestureEvent.data.scrollUpdate.inertial = true;
 
         if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
             return handleGestureEvent(syntheticGestureEvent);
@@ -1935,7 +1939,8 @@ void WebViewImpl::beginFrame(const WebBeginFrameArgs& frameTime)
             PlatformGestureEvent endScrollEvent(PlatformEvent::GestureScrollEnd,
                 m_positionOnFlingStart, m_globalPositionOnFlingStart,
                 IntSize(), 0, false, false, false, false,
-                0, 0, 0, 0, false);
+                0, 0, m_lastScrollVelocity.width, m_lastScrollVelocity.height, false, true);
+            m_lastScrollVelocity = FloatSize(0, 0);
 
             mainFrameImpl()->frame()->eventHandler().handleGestureScrollEnd(endScrollEvent);
         }