cc : Use same layer skipping functions in DrawPropertyUtils and LTHC

cc/trees/draw_property_utils.h

Index: cc/trees/draw_property_utils.h
diff --git a/cc/trees/draw_property_utils.h b/cc/trees/draw_property_utils.h
index ddcdac9770d59ca75e8d02d6858aeacf8f72f37e..ef9cdf7ce6522277339f98554133bdf2445c5518 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -91,6 +91,18 @@ void CC_EXPORT ComputeLayerDrawProperties(LayerImpl* layer,
 void CC_EXPORT ComputeSurfaceDrawProperties(const PropertyTrees* property_trees,
                                             RenderSurfaceImpl* render_surface);
 
+bool CC_EXPORT LayerShouldBeSkipped(LayerImpl* layer,
+                                    bool layer_is_drawn,
+                                    const TransformTree& transform_tree);
+
+bool CC_EXPORT LayerNeedsUpdate(Layer* layer,
+                                bool layer_is_drawn,
+                                const TransformTree& tree);
+
+bool CC_EXPORT LayerNeedsUpdate(LayerImpl* layer,
+                                bool layer_is_drawn,
+                                const TransformTree& tree);
+
 gfx::Transform CC_EXPORT DrawTransform(const LayerImpl* layer,
                                        const TransformTree& tree);