Allow postponed rail application for touch scrolling - blink side.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 648 matching lines @@
         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;
+        syntheticGestureEvent.data.scrollUpdate.railsMode = m_railStateOnFlingStart;
 
         if (m_page && m_page->mainFrame() && m_page->mainFrame()->isLocalFrame() && m_page->deprecatedLocalMainFrame()->view())
             return handleGestureEvent(syntheticGestureEvent);
     }
     return false;
 }
 
 bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
 {
     if (!m_client)
         return false;
 
     bool eventSwallowed = false;
     bool eventCancelled = false; // for disambiguation
 
     // Special handling for slow-path fling gestures.
     switch (event.type) {
     case WebInputEvent::GestureFlingStart: {
         if (mainFrameImpl()->frame()->eventHandler().isScrollbarHandlingGestures())
             break;
         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()));
         ASSERT(flingCurve);
         m_gestureAnimation = WebActiveGestureAnimation::createAtAnimationStart(flingCurve.release(), this);
         scheduleAnimation();
         eventSwallowed = true;
 
         m_client->didHandleGestureEvent(event, eventCancelled);
         return eventSwallowed;
@@ skipping 1186 matching lines @@
     // Create synthetic wheel events as necessary for fling.
     if (m_gestureAnimation) {
         if (m_gestureAnimation->animate(validFrameTime.lastFrameTimeMonotonic))
             scheduleAnimation();
         else {
             endActiveFlingAnimation();
 
             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);
         }
     }
 
     if (!m_page)
         return;
 
     // FIXME: This should probably be using the local root?
     if (m_page->mainFrame()->isLocalFrame())
@@ skipping 2604 matching lines @@
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 } // namespace blink