cc : Stop calculating visible rects on main thread

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 913234a9324c976edd7a94af7c5fea5218d61c34..1859ff521352f3b7f7dda2dceb3c14bb8b4a9807 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -54,9 +54,7 @@ void CC_EXPORT BuildPropertyTreesAndComputeVisibleRects(
     float device_scale_factor,
     const gfx::Rect& viewport,
     const gfx::Transform& device_transform,
-    bool can_render_to_separate_surface,
-    PropertyTrees* property_trees,
-    LayerList* update_layer_list);
+    PropertyTrees* property_trees);
 
 void CC_EXPORT BuildPropertyTreesAndComputeVisibleRects(
     LayerImpl* root_layer,
@@ -73,10 +71,15 @@ void CC_EXPORT BuildPropertyTreesAndComputeVisibleRects(
     PropertyTrees* property_trees,
     LayerImplList* visible_layer_list);
 
-void CC_EXPORT ComputeVisibleRects(Layer* root_layer,
-                                   PropertyTrees* property_trees,
-                                   bool can_render_to_separate_surface,
-                                   LayerList* update_layer_list);
+void CC_EXPORT Update(Layer* root_layer,

[jaydasika, 2016/04/02 02:54:10]

need to name this better :) It updates property trees, render surfaces and finds
layers that need update.

[ajuma, 2016/04/04 14:15:05]

How about splitting this into three functions?

[jaydasika, 2016/04/04 18:41:09]

Done.

+                      PropertyTrees* property_trees,
+                      bool can_render_to_separate_surface,
+                      LayerList* update_layer_list);
+
+void CC_EXPORT
+ComputeVisibleRectsForTesting(PropertyTrees* property_trees,
+                              bool can_render_to_separate_surface,
+                              LayerList* visible_layer_list);
 
 void CC_EXPORT ComputeVisibleRects(LayerImpl* root_layer,
                                    PropertyTrees* property_trees,