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

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 4166b0be38990a81356a0b879a2e77093e72288c..04bb8931399a4f61d76e599e7afc361e0f730c36 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3940,16 +3940,14 @@ TouchAction EventHandler::computeEffectiveTouchAction(const LayoutPoint& point)
     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. For now this is trivial, but when we

[Rick Byers, 2014/04/04 01:22:28]

nit: This "for now this is trivial" comment is old (from my first CL where we
had only auto/none), can you please remove it while you're here?

+    // add more types of actions it'll get a little more complex.
     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)