Update touch-action hit-testing to match latest spec changes.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 3922 matching lines @@
     // Optimization to minimize risk of this new feature (behavior should be identical
     // since there's no way to get non-default touch-action values).
     if (!RuntimeEnabledFeatures::cssTouchActionEnabled())
         return TouchActionAuto;
 
     HitTestResult taResult = hitTestResultAtPoint(point, HitTestRequest::TouchEvent | HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::TouchAction);
     Node* node = taResult.innerNode();
     if (!node)
         return TouchActionAuto;
 
-    // Start by permitting all actions, then walk the block level elements from
-    // the target node up to the nearest scrollable ancestor and exclude any
-    // prohibited actions. For now this is trivial, but when we add more types
-    // of actions it'll get a little more complex.
+    // Start by permitting all actions, then walk the elements supporting
+    // touch-action from the target node up to the nearest scrollable ancestor
+    // and exclude any prohibited actions.
     TouchAction effectiveTouchAction = TouchActionAuto;
     for (const Node* curNode = node; curNode; curNode = NodeRenderingTraversal::parent(curNode)) {
-        // The spec says only block and SVG elements get touch-action.
-        // FIXME(rbyers): Add correct support for SVG, crbug.com/247396.
         if (RenderObject* renderer = curNode->renderer()) {
-            if (renderer->isRenderBlockFlow()) {
+            if (renderer->visibleForTouchAction()) {
                 TouchAction action = renderer->style()->touchAction();
                 effectiveTouchAction = intersectTouchAction(action, effectiveTouchAction);
                 if (effectiveTouchAction == TouchActionNone)
                     break;
             }
 
             // If we've reached an ancestor that supports a touch action, search no further.
             if (renderer->isBox() && toRenderBox(renderer)->scrollsOverflow())
                 break;
         }
@@ skipping 79 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore