cc : Use same layer skipping functions in DrawPropertyUtils and LTHC

cc/trees/draw_property_utils.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_DRAW_PROPERTY_UTILS_H_
 #define CC_TREES_DRAW_PROPERTY_UTILS_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer_collections.h"
 
@@ skipping 73 matching lines @@
                                    LayerImplList* visible_layer_list);
 
 void CC_EXPORT ComputeLayerDrawProperties(LayerImpl* layer,
                                           const PropertyTrees* property_trees,
                                           bool layers_always_allowed_lcd_text,
                                           bool can_use_lcd_text);
 
 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);
 
 gfx::Transform CC_EXPORT ScreenSpaceTransform(const Layer* layer,
                                               const TransformTree& tree);
 
 gfx::Transform CC_EXPORT ScreenSpaceTransform(const LayerImpl* layer,
                                               const TransformTree& tree);
 
 void CC_EXPORT UpdatePageScaleFactor(PropertyTrees* property_trees,
@@ skipping 15 matching lines @@
 
 void CC_EXPORT
 UpdateElasticOverscroll(PropertyTrees* property_trees,
                         const Layer* overscroll_elasticity_layer,
                         const gfx::Vector2dF& elastic_overscroll);
 
 }  // namespace draw_property_utils
 }  // namespace cc
 
 #endif  // CC_TREES_DRAW_PROPERTY_UTILS_H_