Allow postponed rail application for touch scrolling - blink side.

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 48c5120e1a3c90d399edb2a6627479408dac94e3..4a63ac74c3a854cf766c3f7e1bfa9d5bd60b924a 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -666,6 +666,7 @@ bool WebViewImpl::scrollBy(const WebFloatSize& delta, const WebFloatSize& veloci
         syntheticGestureEvent.modifiers = m_flingModifier;
         syntheticGestureEvent.sourceDevice = WebGestureDeviceTouchscreen;
         syntheticGestureEvent.data.scrollUpdate.inertial = true;
+        syntheticGestureEvent.data.scrollUpdate.railsMode = m_railStateOnFlingStart;
 
         if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
             return handleGestureEvent(syntheticGestureEvent);
@@ -689,6 +690,7 @@ bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
         m_client->cancelScheduledContentIntents();
         m_positionOnFlingStart = WebPoint(event.x, event.y);
         m_globalPositionOnFlingStart = WebPoint(event.globalX, event.globalY);
+        m_railStateOnFlingStart = event.data.flingStart.railsMode;
         m_flingModifier = event.modifiers;
         m_flingSourceDevice = event.sourceDevice;
         OwnPtr<WebGestureCurve> flingCurve = adoptPtr(Platform::current()->createFlingAnimationCurve(event.sourceDevice, WebFloatPoint(event.data.flingStart.velocityX, event.data.flingStart.velocityY), WebSize()));
@@ -1895,7 +1897,8 @@ void WebViewImpl::beginFrame(const WebBeginFrameArgs& frameTime)
             PlatformGestureEvent endScrollEvent(PlatformEvent::GestureScrollEnd,
                 m_positionOnFlingStart, m_globalPositionOnFlingStart,
                 IntSize(), 0, false, false, false, false);
-            endScrollEvent.setScrollGestureData(0, 0, 0, 0, true, false);
+            endScrollEvent.setScrollGestureData(0, 0, 0, 0, true, false,
+                PlatformEvent::RailsModeFree);
 
             mainFrameImpl()->frame()->eventHandler().handleGestureScrollEnd(endScrollEvent);
         }