Add touchEventHandlerRegion to Layer and LayerImpl

cc/layer.h

Index: cc/layer.h
diff --git a/cc/layer.h b/cc/layer.h
index d827ed4e37ddc963b8ab0407662ef7ad3ddbd477..bba4f92efb028cc1f287268f42ee00bcf8d2c28d 100644
--- a/cc/layer.h
+++ b/cc/layer.h
@@ -148,6 +148,10 @@ public:
     void setNonFastScrollableRegionChanged() { m_nonFastScrollableRegionChanged = true; }
     const Region& nonFastScrollableRegion() const { return m_nonFastScrollableRegion; }
 
+    void setTouchEventHandlerRegion(const Region&);
+    void setTouchEventHandlerRegionChanged() { m_touchEventHandlerRegionChanged = true; }
+    const Region& touchEventHandlerRegion() const { return m_touchEventHandlerRegion; }
+
     void setLayerScrollClient(WebKit::WebLayerScrollClient* layerScrollClient) { m_layerScrollClient = layerScrollClient; }
 
     void setDrawCheckerboardForMissingTiles(bool);
@@ -351,6 +355,8 @@ private:
     bool m_haveWheelEventHandlers;
     Region m_nonFastScrollableRegion;
     bool m_nonFastScrollableRegionChanged;
+    Region m_touchEventHandlerRegion;
+    bool m_touchEventHandlerRegionChanged;
     gfx::PointF m_position;
     gfx::PointF m_anchorPoint;
     SkColor m_backgroundColor;